jfs: validate max amount of blocks before allocation.

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[ Upstream commit 0225e10972 ]

The lack of checking bmp->db_max_freebud in extBalloc() can lead to
shift out of bounds, so this patch prevents undefined behavior, because
bmp->db_max_freebud == -1 only if there is no free space.

Signed-off-by: Aleksei Filippov <halip0503@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-and-tested-by: syzbot+5f088f29593e6b4c8db8@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?id=01abadbd6ae6a08b1f1987aa61554c6b3ac19ff2
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Alexei Filippov 2023-08-19 20:32:16 +03:00 • committed by Greg Kroah-Hartman

parent 105f7fd386

commit ac8a5bd24c

1 changed files with 5 additions and 0 deletions

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fs/jfs/jfs_extent.c

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