Vulnerability CVE-2024-43828
Published: 2024-08-17

Description:
In the Linux kernel, the following vulnerability has been resolved:

ext4: fix infinite loop when replaying fast_commit

When doing fast_commit replay an infinite loop may occur due to an
uninitialized extent_status struct. ext4_ext_determine_insert_hole() does
not detect the replay and calls ext4_es_find_extent_range(), which will
return immediately without initializing the 'es' variable.

Because 'es' contains garbage, an integer overflow may happen causing an
infinite loop in this function, easily reproducible using fstest generic/039.

This commit fixes this issue by unconditionally initializing the structure
in function ext4_es_find_extent_range().

Thanks to Zhang Yi, for figuring out the real problem!

 References:
https://git.kernel.org/stable/c/181e63cd595c688194e07332f9944b3a63193de2
https://git.kernel.org/stable/c/c6e67df64783e99a657ef2b8c834ba2bf54c539c
https://git.kernel.org/stable/c/81f819c537d29932e4b9267f02411cbc8b355178
https://git.kernel.org/stable/c/907c3fe532253a6ef4eb9c4d67efb71fab58c706
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