From: Ghanshyam Agrawal <ghanshyam1898@gmail.com>
Date: Sat, 28 Sep 2024 08:37:22 +0000 (+0530)
Subject: jfs: array-index-out-of-bounds fix in dtReadFirst
X-Git-Tag: v6.13-rc1~128^2~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ca84a2c9be482836b86d780244f0357e5a778c46;p=thirdparty%2Fkernel%2Flinux.git

jfs: array-index-out-of-bounds fix in dtReadFirst

The value of stbl can be sometimes out of bounds due
to a bad filesystem. Added a check with appopriate return
of error code in that case.

Reported-by: syzbot+65fa06e29859e41a83f3@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=65fa06e29859e41a83f3
Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
---

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 5d3127ca68a42..69fd936fbdb37 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -3086,6 +3086,13 @@ static int dtReadFirst(struct inode *ip, struct btstack * btstack)
 
 		/* get the leftmost entry */
 		stbl = DT_GETSTBL(p);
+
+		if (stbl[0] < 0 || stbl[0] > 127) {
+			DT_PUTPAGE(mp);
+			jfs_error(ip->i_sb, "stbl[0] out of bound\n");
+			return -EIO;
+		}
+
 		xd = (pxd_t *) & p->slot[stbl[0]];
 
 		/* get the child page block address */