Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats() When blkg_alloc() is called to allocate a blkcg_gq structure with the associated blkg_iostat_set's, there are 2 fields within blkg_iostat_set that requires proper initialization - blkg & sync. The former field was introduced by commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()") while the later one was introduced by commit f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat"). Unfortunately those fields in the blkg_iostat_set's are not properly re-initialized when they are cleared in v1's blkcg_reset_stats(). This can lead to a kernel panic due to NULL pointer access of the blkg pointer. The missing initialization of sync is less problematic and can be a problem in a debug kernel due to missing lockdep initialization. Fix these problems by re-initializing them after memory clearing.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f73316482977ac401ac37245c9df48079d4e11f3 before 58c135513562698f222a58ba07dbdfcfb268aa0d; affected f73316482977ac401ac37245c9df48079d4e11f3 before 0561aa6033dd181594116d705c41fc16e97161a2; affected f73316482977ac401ac37245c9df48079d4e11f3 before 892faa76be894d324bf48b12a55c7af7be2bad83; affected f73316482977ac401ac37245c9df48079d4e11f3 before b0d26283af612b9e0cc3188b0b88ad7fdea447e8; affected f73316482977ac401ac37245c9df48079d4e11f3 before abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2; affected f73316482977ac401ac37245c9df48079d4e11f3 before 3d2af77e31ade05ff7ccc3658c3635ec1bea0979 |
| Linux / Linux | affected 5.5; unaffected 0 before 5.5; unaffected 5.10.258 through 5.10.*; unaffected 5.15.199 through 5.15.*; unaffected 6.1.162 through 6.1.*; unaffected 6.3.13 through 6.3.*; unaffected 6.4.4 through 6.4.*; unaffected 6.5 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/58c135513562698f222a58ba07dbdfcfb268aa0d
- https://git.kernel.org/stable/c/0561aa6033dd181594116d705c41fc16e97161a2
- https://git.kernel.org/stable/c/892faa76be894d324bf48b12a55c7af7be2bad83
- https://git.kernel.org/stable/c/b0d26283af612b9e0cc3188b0b88ad7fdea447e8
- https://git.kernel.org/stable/c/abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2
- https://git.kernel.org/stable/c/3d2af77e31ade05ff7ccc3658c3635ec1bea0979
ADP enrichment
No English description supplied.
No references supplied.