196 lines
10 KiB
JSON
196 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-49272",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-02-26T01:49:39.297Z",
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"datePublished": "2025-02-26T01:56:18.626Z",
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"dateUpdated": "2026-05-11T18:56:29.104Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-11T18:56:29.104Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Fix potential AB/BA lock with buffer_mutex and mmap_lock\n\nsyzbot caught a potential deadlock between the PCM\nruntime->buffer_mutex and the mm->mmap_lock. It was brought by the\nrecent fix to cover the racy read/write and other ioctls, and in that\ncommit, I overlooked a (hopefully only) corner case that may take the\nrevert lock, namely, the OSS mmap. The OSS mmap operation\nexceptionally allows to re-configure the parameters inside the OSS\nmmap syscall, where mm->mmap_mutex is already held. Meanwhile, the\ncopy_from/to_user calls at read/write operations also take the\nmm->mmap_lock internally, hence it may lead to a AB/BA deadlock.\n\nA similar problem was already seen in the past and we fixed it with a\nrefcount (in commit b248371628aa). The former fix covered only the\ncall paths with OSS read/write and OSS ioctls, while we need to cover\nthe concurrent access via both ALSA and OSS APIs now.\n\nThis patch addresses the problem above by replacing the buffer_mutex\nlock in the read/write operations with a refcount similar as we've\nused for OSS. The new field, runtime->buffer_accessing, keeps the\nnumber of concurrent read/write operations. Unlike the former\nbuffer_mutex protection, this protects only around the\ncopy_from/to_user() calls; the other codes are basically protected by\nthe PCM stream lock. The refcount can be a negative, meaning blocked\nby the ioctls. If a negative value is seen, the read/write aborts\nwith -EBUSY. In the ioctl side, OTOH, they check this refcount, too,\nand set to a negative value for blocking unless it's already being\naccessed."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/sound/pcm.h",
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"sound/core/pcm.c",
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"sound/core/pcm_lib.c",
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"sound/core/pcm_native.c"
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],
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"versions": [
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{
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"version": "73867cb2bc7dfa7fbd219e53a0b68d253d8fda09",
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"lessThan": "7e9133607e1501c94881be35e118d8f84d96dcb4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b3830197aa7413c65767cf5a1aa8775c83f0dbf7",
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"lessThan": "40f4cffbe13a51faf136faf5f9ef6847782cd595",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "08d1807f097a63ea00a7067dad89c1c81cb2115e",
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"lessThan": "9661bf674d6a82b76e4ae424438a8ce1e3ed855d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8527c8f052fb42091c6569cb928e472376a4a889",
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"lessThan": "9017201e8d8c6d1472273361389ed431188584a0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "47711ff10c7e126702cfa725f6d86ef529d15a5f",
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"lessThan": "7777744e92a0b30e3e0cce2758d911837011ebd9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4d1b0ace2d56dc27cc4921eda7fae57f77f03eb5",
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"lessThan": "abedf0d08c79d76da0d6fa0d5dbbc98871dcbc2e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dd2f8c684da3e226e5ec7a81c89ff5fd4a957a03",
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"lessThan": "be9813ad2fc8f0885f5ce6925af0d993ce5da4e5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "dca947d4d26dbf925a64a6cfb2ddbc035e831a3d",
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"lessThan": "bc55cfd5718c7c23e5524582e9fa70b4d10f2433",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/sound/pcm.h",
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"sound/core/pcm.c",
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"sound/core/pcm_lib.c",
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"sound/core/pcm_native.c"
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],
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"versions": [
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{
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"version": "5.10.109",
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"lessThan": "5.10.110",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.32",
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"lessThan": "5.15.33",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.16.18",
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"lessThan": "5.16.19",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.17.1",
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"lessThan": "5.17.2",
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"status": "affected",
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"versionType": "semver"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10.109",
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"versionEndExcluding": "5.10.110"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15.32",
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"versionEndExcluding": "5.15.33"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.16.18",
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"versionEndExcluding": "5.16.19"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.17.1",
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"versionEndExcluding": "5.17.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7e9133607e1501c94881be35e118d8f84d96dcb4"
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},
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{
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"url": "https://git.kernel.org/stable/c/40f4cffbe13a51faf136faf5f9ef6847782cd595"
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},
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{
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"url": "https://git.kernel.org/stable/c/9661bf674d6a82b76e4ae424438a8ce1e3ed855d"
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},
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{
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"url": "https://git.kernel.org/stable/c/9017201e8d8c6d1472273361389ed431188584a0"
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},
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{
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"url": "https://git.kernel.org/stable/c/7777744e92a0b30e3e0cce2758d911837011ebd9"
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},
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{
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"url": "https://git.kernel.org/stable/c/abedf0d08c79d76da0d6fa0d5dbbc98871dcbc2e"
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},
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{
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"url": "https://git.kernel.org/stable/c/be9813ad2fc8f0885f5ce6925af0d993ce5da4e5"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc55cfd5718c7c23e5524582e9fa70b4d10f2433"
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}
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],
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"title": "ALSA: pcm: Fix potential AB/BA lock with buffer_mutex and mmap_lock",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |