linux-kernel - Re: Syakaller testing for KASAN: slab-out-of-bounds Read in dbAllocBits bug

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Message-Id: <20251125192824.151904-1-activprithvi@gmail.com>
Date: Wed, 26 Nov 2025 00:58:24 +0530
From: Prithvi Tambewagh <activprithvi@...il.com>
To: syzbot+0be47376a6acbcba7f0d@...kaller.appspotmail.com
Cc: jfs-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	shaggy@...nel.org,
	syzkaller-bugs@...glegroups.com,
	Prithvi Tambewagh <activprithvi@...il.com>
Subject: Re: Syakaller testing for KASAN: slab-out-of-bounds Read in dbAllocBits bug  

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 7367539ad4b0f8f9b396baf02110962333719a48

Signed-off-by: Prithvi Tambewagh <activprithvi@...il.com>
---
 fs/jfs/jfs_dmap.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index cb3cda1390ad..8dba15c83a49 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -2142,6 +2142,11 @@ static void dbAllocBits(struct bmap * bmp, struct dmap * dp, s64 blkno,
 	int size;
 	s8 *leaf;
 
+	if(blkno >= le64_to_cpu(bmp->db_mapsize)) {
+		jfs_error(bmp->db_ipbmap->i_sb, "Allocation request out of bounds\n");
+		return;
+	}
+
 	/* pick up a pointer to the leaves of the dmap tree */
 	leaf = dp->tree.stree + LEAFIND;
 

base-commit: 7367539ad4b0f8f9b396baf02110962333719a48
-- 
2.34.1