jfs: Fix shift-out-of-bounds in dbDiscardAG

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[ Upstream commit 7063b80268 ]

When searching for the next smaller log2 block, BLKSTOL2() returned 0,
causing shift exponent -1 to be negative.

This patch fixes the issue by exiting the loop directly when negative
shift is found.

Reported-by: syzbot+61be3359d2ee3467e7e4@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=61be3359d2ee3467e7e4
Signed-off-by: Pei Li <peili.dev@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Pei Li 2024-06-25 09:42:05 -07:00 • committed by Greg Kroah-Hartman

parent 6ea10dbb1e

commit f650148b43

1 changed files with 2 additions and 0 deletions

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fs/jfs/jfs_dmap.c

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