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

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Message-Id: <20250322130257.227256-1-duttaditya18@gmail.com>
Date: Sat, 22 Mar 2025 18:32:57 +0530
From: Aditya Dutt <duttaditya18@...il.com>
To: syzbot+b974bd41515f770c608b@...kaller.appspotmail.com
Cc: jfs-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	shaggy@...nel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in add_missing_indices

#syz test

diff --git i/fs/jfs/jfs_dtree.c w/fs/jfs/jfs_dtree.c
index 93db6eec4465..de33026d18d2 100644
--- i/fs/jfs/jfs_dtree.c
+++ w/fs/jfs/jfs_dtree.c
@@ -2613,7 +2613,7 @@ void dtInitRoot(tid_t tid, struct inode *ip, u32 idotdot)
  *	     fsck.jfs should really fix this, but it currently does not.
  *	     Called from jfs_readdir when bad index is detected.
  */
-static void add_missing_indices(struct inode *inode, s64 bn)
+static int add_missing_indices(struct inode *inode, s64 bn)
 {
 	struct ldtentry *d;
 	struct dt_lock *dtlck;
@@ -2622,7 +2622,7 @@ static void add_missing_indices(struct inode *inode, s64 bn)
 	struct lv *lv;
 	struct metapage *mp;
 	dtpage_t *p;
-	int rc;
+	int rc = 0;
 	s8 *stbl;
 	tid_t tid;
 	struct tlock *tlck;
@@ -2647,6 +2647,16 @@ static void add_missing_indices(struct inode *inode, s64 bn)
 
 	stbl = DT_GETSTBL(p);
 	for (i = 0; i < p->header.nextindex; i++) {
+		if (stbl[i] < 0) {
+			jfs_err("jfs: add_missing_indices: Invalid stbl[%d] = %d for inode %ld, block = %lld",
+				i, stbl[i], (long)inode->i_ino, (long long)bn);
+			rc = -EIO;
+
+			DT_PUTPAGE(mp);
+			txAbort(tid, 0);
+			goto end;
+		}
+
 		d = (struct ldtentry *) &p->slot[stbl[i]];
 		index = le32_to_cpu(d->index);
 		if ((index < 2) || (index >= JFS_IP(inode)->next_index)) {
@@ -2664,6 +2674,7 @@ static void add_missing_indices(struct inode *inode, s64 bn)
 	(void) txCommit(tid, 1, &inode, 0);
 end:
 	txEnd(tid);
+	return rc;
 }
 
 /*
@@ -3017,7 +3028,10 @@ int jfs_readdir(struct file *file, struct dir_context *ctx)
 		}
 
 		if (fix_page) {
-			add_missing_indices(ip, bn);
+			if ((rc = add_missing_indices(ip, bn))) {
+				jfs_err("jfs_readdir: add_missing_indices returned %d", rc);
+				goto out;
+			}
 			page_fixed = 1;
 		}