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jfs: UBSAN: shift-out-of-bounds in dbFindBits

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[ Upstream commit b0b2fc815e514221f01384f39fbfbff65d897e1c ]

Fix issue with UBSAN throwing shift-out-of-bounds warning.

Reported-by: syzbot+e38d703eeb410b17b473@syzkaller.appspotmail.com
Signed-off-by: Remington Brasga <rbrasga@uci.edu>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Remington Brasga 2024-07-10 00:12:44 +00:00 committed by Ksawlii
parent 831ba4bca0
commit 41aeda6a14
1 changed files with 1 additions and 1 deletions
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fs/jfs/jfs_dmap.c
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@ -3084,7 +3084,7 @@ static int dbFindBits(u32 word, int l2nb)
/* scan the word for nb free bits at nb alignments.
*/
for (bitno = 0; mask != 0; bitno += nb, mask >>= nb) {
for (bitno = 0; mask != 0; bitno += nb, mask = (mask >> nb)) {
if ((mask & word) == mask)
break;
}