[PATCH AUTOSEL 4.19 03/12] jfs: fix slab-out-of-bounds Read in dtSearch

[Sasha Levin]

From: Manas Ghandat <ghandatmanas@xxxxxxxxx>

[ Upstream commit fa5492ee89463a7590a1449358002ff7ef63529f ]

Currently while searching for current page in the sorted entry table
of the page there is a out of bound access. Added a bound check to fix
the error.

Dave:
Set return code to -EIO

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Closes: https://lore.kernel.org/r/202310241724.Ed02yUz9-lkp@xxxxxxxxx/
Signed-off-by: Manas Ghandat <ghandatmanas@xxxxxxxxx>
Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/jfs/jfs_dtree.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 320c9f42b65b..ea2c8f0fe832 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -646,6 +646,11 @@ int dtSearch(struct inode *ip, struct component_name * key, ino_t * data,
 		for (base = 0, lim = p->header.nextindex; lim; lim >>= 1) {
 			index = base + (lim >> 1);
 
+			if (stbl[index] < 0) {
+				rc = -EIO;
+				goto out;
+			}
+
 			if (p->header.flag & BT_LEAF) {
 				/* uppercase leaf name to compare */
 				cmp =
-- 
2.43.0