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Message-ID: <VI1P193MB0752266E3E55B2D918F8E43799C4A@VI1P193MB0752.EURP193.PROD.OUTLOOK.COM>
Date: Tue, 3 Oct 2023 18:49:22 +0800
From: Juntong Deng <juntong.deng@...look.com>
To: shaggy@...nel.org, cuigaosheng1@...wei.com
Cc: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
linux-kernel-mentees@...ts.linuxfoundation.org,
syzbot+76a072c2f8a60280bd70@...kaller.appspotmail.com
Subject: [PATCH] fs/jfs: Add checking for out-of-bounds index in binary search in xtSearch
There is currently no out-of-bounds check for the index in a binary
search, which may cause errors.
The following is related bug reported by Syzbot:
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:360:4
index 18 is out of range for type 'xad_t [18]'
Checking if the index exceeds the size of the xad array can solve
this bug.
Reported-by: syzbot+76a072c2f8a60280bd70@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=76a072c2f8a60280bd70
Signed-off-by: Juntong Deng <juntong.deng@...look.com>
---
fs/jfs/jfs_xtree.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/jfs/jfs_xtree.c b/fs/jfs/jfs_xtree.c
index 2d304cee884c..6b55bb1e4089 100644
--- a/fs/jfs/jfs_xtree.c
+++ b/fs/jfs/jfs_xtree.c
@@ -356,6 +356,8 @@ static int xtSearch(struct inode *ip, s64 xoff, s64 *nextp,
*/
for (base = XTENTRYSTART; lim; lim >>= 1) {
index = base + (lim >> 1);
+ if (index >= XTROOTMAXSLOT)
+ break;
XT_CMP(cmp, xoff, &p->xad[index], t64);
if (cmp == 0) {
--
2.39.2
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