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jfs: fix shift-out-of-bounds in dbSplit

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BugLink: https://bugs.launchpad.net/bugs/2102118

[ Upstream commit a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d ]

When dmt_budmin is less than zero, it causes errors
in the later stages. Added a check to return an error beforehand
in dbAllocCtl itself.

Reported-by: syzbot+b5ca8a249162c4b9a7d0@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b5ca8a249162c4b9a7d0
Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
CVE-2024-56597
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Ghanshyam Agrawal
2025-03-12 22:51:00 +09:00
committed by Stefan Bader
parent 1a4757a377
commit ba5fe3154c
1 changed files with 3 additions and 0 deletions
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fs/jfs/jfs_dmap.c
+3
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@@ -1820,6 +1820,9 @@ dbAllocCtl(struct bmap * bmp, s64 nblocks, int l2nb, s64 blkno, s64 * results)
return -EIO;
dp = (struct dmap *) mp->data;
if (dp->tree.budmin < 0)
return -EIO;
/* try to allocate the blocks.
*/
rc = dbAllocDmapLev(bmp, dp, (int) nblocks, l2nb, results);