linux-kernel - [PATCH] jfs: fix array-index-out-of-bounds in jfs

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Message-Id: <20241001060548.3090738-1-ghanshyam1898@gmail.com>
Date: Tue,  1 Oct 2024 11:35:47 +0530
From: Ghanshyam Agrawal <ghanshyam1898@...il.com>
To: shaggy@...nel.org,
	eadavis@...com,
	osmtendev@...il.com,
	ghandatmanas@...il.com
Cc: Ghanshyam Agrawal <ghanshyam1898@...il.com>,
	jfs-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	syzbot+0315f8fe99120601ba88@...kaller.appspotmail.com
Subject: [PATCH] jfs: fix array-index-out-of-bounds in jfs_readdir

The stbl might contain some invalid values. Added a check to
return error code in that case.

Reported-by: syzbot+0315f8fe99120601ba88@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=0315f8fe99120601ba88
Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@...il.com>
---
 fs/jfs/jfs_dtree.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 5d3127ca68a4..c8f6e51ac047 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -2891,6 +2891,14 @@ int jfs_readdir(struct file *file, struct dir_context *ctx)
 		stbl = DT_GETSTBL(p);
 
 		for (i = index; i < p->header.nextindex; i++) {
+			if (stbl[i] < 0 || stbl[i] > 127) {
+				DT_PUTPAGE(mp);
+				free_page(dirent_buf);
+				jfs_err("JFS: Invalid stbl[%d] = %d for inode %ld, block = %lld",
+				i, stbl[i], (long)ip->i_ino, (long long)bn);
+				return -EIO;
+			}
+
 			d = (struct ldtentry *) & p->slot[stbl[i]];
 
 			if (((long) jfs_dirent + d->namlen + 1) >
-- 
2.34.1