In the Linux kernel, the following vulnerability has been...
High severity
Unreviewed
Published
Oct 21, 2024
to the GitHub Advisory Database
•
Updated Nov 17, 2024
Description
Published by the National Vulnerability Database
Oct 21, 2024
Published to the GitHub Advisory Database
Oct 21, 2024
Last updated
Nov 17, 2024
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix timer use-after-free on failed mount
Syzbot has found an ODEBUG bug in ext4_fill_super
The del_timer_sync function cancels the s_err_report timer,
which reminds about filesystem errors daily. We should
guarantee the timer is no longer active before kfree(sbi).
When filesystem mounting fails, the flow goes to failed_mount3,
where an error occurs when ext4_stop_mmpd is called, causing
a read I/O failure. This triggers the ext4_handle_error function
that ultimately re-arms the timer,
leaving the s_err_report timer active before kfree(sbi) is called.
Fix the issue by canceling the s_err_report timer after calling ext4_stop_mmpd.
References