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authorJan Kara2023-05-04 14:55:24 +0200
committerTheodore Ts'o2023-05-13 18:05:04 -0400
commit492888df0c7b42fc0843631168b0021bc4caee84 (patch)
treedc11ae138e5738d0b5e9e471b650ad5ad71b80d7 /drivers/uio
parent00d873c17e29cc32d90ca852b82685f1673acaa5 (diff)
ext4: fix data races when using cached status extents
When using cached extent stored in extent status tree in tree->cache_es another process holding ei->i_es_lock for reading can be racing with us setting new value of tree->cache_es. If the compiler would decide to refetch tree->cache_es at an unfortunate moment, it could result in a bogus in_range() check. Fix the possible race by using READ_ONCE() when using tree->cache_es only under ei->i_es_lock for reading. Cc: stable@kernel.org Reported-by: syzbot+4a03518df1e31b537066@syzkaller.appspotmail.com Link: https://lore.kernel.org/all/000000000000d3b33905fa0fd4a6@google.com Suggested-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20230504125524.10802-1-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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