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

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Date: Thu, 25 Apr 2024 17:56:54 +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 +++-
 fs/jfs/jfs_imap.c | 8 ++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index cb3cda1390ad..6681a6272ae7 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("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("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("dbExtendFS : %d\n",bmp->db_agl2size);
 	/* compute new number of AG */
 	agno = bmp->db_numag;
 	bmp->db_numag = newsize >> l2agsize;
diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index 2ec35889ad24..c39f7685aa97 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -339,7 +339,7 @@ int diRead(struct inode *ip)
 
 	/* get the ag for the iag */
 	agstart = le64_to_cpu(iagp->agstart);
-
+	printk("diRead : %ld\n",agstart);
 	release_metapage(mp);
 
 	rel_inode = (ino & (INOSPERPAGE - 1));
@@ -881,6 +881,8 @@ int diFree(struct inode *ip)
 	 */
 	agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb));
 
+	printk("%lu %d %d",JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb)->bmap->db_agl2size, agno);
+
 	/* Lock the AG specific inode map information
 	 */
 	AG_LOCK(imap, agno);
@@ -1298,6 +1300,7 @@ diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp)
 	jfs_ip->ixpxd = iagp->inoext[extno];
 	jfs_ip->agstart = le64_to_cpu(iagp->agstart);
 	jfs_ip->active_ag = -1;
+	printk("diInitInode : %lu",jfs_ip->agstart);
 }
 
 
@@ -1908,6 +1911,7 @@ static int diAllocExt(struct inomap * imap, int agno, struct inode *ip)
 		 */
 		iagp->agstart =
 		    cpu_to_le64(AGTOBLK(agno, imap->im_ipimap));
+		printk("diAllocExt : %lu\n",iagp->agstart);
 	} else {
 		/* read the iag.
 		 */
@@ -2898,7 +2902,7 @@ int diExtendFS(struct inode *ipimap, struct inode *ipbmap)
 		agstart = le64_to_cpu(iagp->agstart);
 		n = agstart >> mp->db_agl2size;
 		iagp->agstart = cpu_to_le64((s64)n << mp->db_agl2size);
-
+		printk("diExtendFs : %lu %d\n",agstart, mp->db_agl2size);
 		/* compute backed inodes */
 		numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts))
 		    << L2INOSPEREXT;
-- 
2.34.1