linux-kernel - Re: [syzbot] [syzbot] [jfs?] KASAN: slab-out-of-bounds Write in diWrite

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Date: Thu, 16 May 2024 19:03:41 -0700
From: syzbot <syzbot+aa6df9d3b383bf5f047f@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [syzbot] [jfs?] KASAN: slab-out-of-bounds Write in diWrite

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Subject: [syzbot] [jfs?] KASAN: slab-out-of-bounds Write in diWrite
Author: lizhi.xu@...driver.com

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git ed30a4a51bb1

diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index 2ec35889ad24..d9b302938ed2 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -747,6 +747,8 @@ int diWrite(tid_t tid, struct inode *ip)
 		xp = (dtpage_t *) & dp->di_dtroot;
 		lv = ilinelock->lv;
 		for (n = 0; n < ilinelock->index; n++, lv++) {
+			printk("lv: %p offset:%d %s\n", lv, lv->offset, __func__);
+			if (lv->offset < DTPAGEMAXSLOT)
 			memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
 			       lv->length << L2DTSLOTSIZE);
 		}