CVE-2023-52810
fs/jfs: Add check for negative db_l2nbperpage
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Description
In the Linux kernel, the following vulnerability has been resolved: fs/jfs: Add check for negative db_l2nbperpage l2nbperpage is log2(number of blks per page), and the minimum legal value should be 0, not negative. In the case of l2nbperpage being negative, an error will occur when subsequently used as shift exponent. Syzbot reported this bug: UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:799:12 shift exponent -16777216 is negative
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/0cb567e727339a192f9fd0db00781d73a91d15a6
- https://git.kernel.org/stable/c/1a7c53fdea1d189087544d9a606d249e93c4934b
- https://git.kernel.org/stable/c/491085258185ffc4fb91555b0dba895fe7656a45
- https://git.kernel.org/stable/c/524b4f203afcf87accfe387e846f33f916f0c907
- https://git.kernel.org/stable/c/525b861a008143048535011f3816d407940f4bfa
References (9)
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