linux-kernel - Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in diFree

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Date: Thu, 25 Apr 2024 12:15:58 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+241c815bda521982cb49@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in diFree

please test array-index-out-of-bounds in diFree

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

---
 fs/jfs/jfs_dmap.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index cb3cda1390ad..773b9263e497 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -206,6 +206,7 @@ int dbMount(struct inode *ipbmap)
 	bmp->db_agwidth = le32_to_cpu(dbmp_le->dn_agwidth);
 	bmp->db_agstart = le32_to_cpu(dbmp_le->dn_agstart);
 	bmp->db_agl2size = le32_to_cpu(dbmp_le->dn_agl2size);
+	printk(KERN_DEBUG "dmMount : %d\n",bmp->db_agl2size);
 	if (bmp->db_agl2size > L2MAXL2SIZE - L2MAXAG ||
 	    bmp->db_agl2size < 0) {
 		err = -EINVAL;
@@ -316,6 +317,7 @@ int dbSync(struct inode *ipbmap)
 	dbmp_le->dn_agwidth = cpu_to_le32(bmp->db_agwidth);
 	dbmp_le->dn_agstart = cpu_to_le32(bmp->db_agstart);
 	dbmp_le->dn_agl2size = cpu_to_le32(bmp->db_agl2size);
+	printk(KERN_DEBUG "dbSync : %d\n",bmp->db_agl2size);
 	for (i = 0; i < MAXAG; i++)
 		dbmp_le->dn_agfree[i] = cpu_to_le64(bmp->db_agfree[i]);
 	dbmp_le->dn_agsize = cpu_to_le64(bmp->db_agsize);
@@ -3393,7 +3395,7 @@ int dbExtendFS(struct inode *ipbmap, s64 blkno,	s64 nblocks)
 
 	bmp->db_agl2size = l2agsize;
 	bmp->db_agsize = 1 << l2agsize;
-
+	printk(KERN_DEBUG "dbExtendFS : %d\n",bmp->db_agl2size);
 	/* compute new number of AG */
 	agno = bmp->db_numag;
 	bmp->db_numag = newsize >> l2agsize;
-- 
2.34.1