In the Linux kernel, the following vulnerability has been resolved:
media: mtk-jpeg: Fix use after free bug due to error path handling in mtk_jpeg_dec_device_run
In mtk_jpeg_probe, &jpeg->job_timeout_work is bound with
mtk_jpeg_job_timeout_work.
In mtk_jpeg_dec_device_run, if error happens in
mtk_jpeg_set_dec_dst, it will finally start the worker while
mark the job as finished by invoking v4l2_m2m_job_finish.
There are two methods to trigger the bug. If we remove the
module, it which will call mtk_jpeg_remove to make cleanup.
The possible sequence is as follows, which will cause a
use-after-free bug.
CPU0 CPU1
mtk_jpeg_dec_… |
start worker |
|mtk_jpeg_job_timeout_work
mtk_jpeg_remove |
v4l2_m2m_release |
kfree(m2m_dev); |
|
| v4l2_m2m_get_curr_priv
| m2m_dev->curr_ctx //use
If we close the file descriptor, which will call mtk_jpeg_release,
it will have a similar sequence.
Fix this bug by starting timeout worker only if started jpegdec worker
successfully. Then v4l2_m2m_job_finish will only be called in
either mtk_jpeg_job_timeout_work or mtk_jpeg_dec_device_run.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b2f0d2724ba4",
"lessThan": "43872f44eee6",
"versionType": "git"
},
{
"status": "affected",
"version": "b2f0d2724ba4",
"lessThan": "1b1036c60a37",
"versionType": "git"
},
{
"status": "affected",
"version": "b2f0d2724ba4",
"lessThan": "9fec4db7fff5",
"versionType": "git"
},
{
"status": "affected",
"version": "b2f0d2724ba4",
"lessThan": "8254d54d00eb",
"versionType": "git"
},
{
"status": "affected",
"version": "b2f0d2724ba4",
"lessThan": "6e2f37022f0f",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "206c857dd17d",
"versionType": "git"
}
],
"programFiles": [
"drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.12",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "5.10.210",
"versionType": "custom",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.149",
"versionType": "custom",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.76",
"versionType": "custom",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.15",
"versionType": "custom",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.7.3",
"versionType": "custom",
"lessThanOrEqual": "6.7.*"
},
{
"status": "unaffected",
"version": "6.8",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c"
],
"defaultStatus": "affected"
}
]
git.kernel.org/stable/c/1b1036c60a37a30caf6759a90fe5ecd06ec35590
git.kernel.org/stable/c/206c857dd17d4d026de85866f1b5f0969f2a109e
git.kernel.org/stable/c/43872f44eee6c6781fea1348b38885d8e78face9
git.kernel.org/stable/c/6e2f37022f0fc0893da4d85a0500c9d547fffd4c
git.kernel.org/stable/c/8254d54d00eb6cdb8367399c7f912eb8d354ecd7
git.kernel.org/stable/c/9fec4db7fff54d9b0306a332bab31eac47eeb5f6
lists.debian.org/debian-lts-announce/2024/06/msg00017.html