CVE-2024-44938 Information

Description

In the Linux kernel the following vulnerability has been resolved:

jfs: Fix shift-out-of-bounds in dbDiscardAG

When searching for the next smaller log2 block BLKSTOL2() returned 0 causing shift exponent -1 to be negative.

This patch fixes the issue by exiting the loop directly when negative shift is found.

Reference

https://git.kernel.org/stable/c/f650148b43949ca9e37e820804bb6026fff404f3 https://git.kernel.org/stable/c/234e6ea0855cdb5673d54ecaf7dc5c78f3e84630 https://git.kernel.org/stable/c/7063b80268e2593e58bee8a8d709c2f3ff93e2f2