linux-kernel - [PATCH-v2] jfs: fix slab-out-of-bounds Read in dtSearch

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Date:   Wed, 25 Oct 2023 11:39:07 +0530
From:   Manas Ghandat <ghandatmanas@...il.com>
To:     dan.carpenter@...aro.org, dave.kleikamp@...cle.com,
        shaggy@...nel.org
Cc:     Manas Ghandat <ghandatmanas@...il.com>,
        Linux-kernel-mentees@...ts.linuxfoundation.org,
        jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
        oe-kbuild@...ts.linux.dev
Subject: [PATCH-v2] jfs: fix slab-out-of-bounds Read in dtSearch

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.

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202310241724.Ed02yUz9-lkp@intel.com/
Signed-off-by: Manas Ghandat <ghandatmanas@...il.com>
---
V1 -> V2 : Removed redundant check on stbl

 fs/jfs/jfs_dtree.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 92b7c533407c..cf67d32d5b7f 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -633,6 +633,9 @@ 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)
+				goto out;
+
 			if (p->header.flag & BT_LEAF) {
 				/* uppercase leaf name to compare */
 				cmp =
-- 
2.37.2