ext4: remove a BUG_ON in ext4_mb_release_group_pa()
commit 463808f2 upstream. If a malicious fuzzer overwrites the ext4 superblock while it is mounted such that the s_first_data_block is set to a very large number, the calculation of the block group can underflow, and trigger a BUG_ON check. Change this to be an ext4_warning so that we don't crash the kernel. Cc: stable@kernel.org Link: https://lore.kernel.org/r/20230430154311.579720-3-tytso@mit.edu Reported-by:<syzbot+e2efa3efc15a1c9e95c3@syzkaller.appspotmail.com> Link: https://syzkaller.appspot.com/bug?id=69b28112e098b070f639efb356393af3ffec4220 Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
parent
c012309a
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