linux-kernel - Re: [syzbot] Re: [syzbot] [ntfs3?] KASAN: slab-out-of-bounds Read in mi_enum

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Date: Thu, 01 Feb 2024 18:49:54 -0800
From: syzbot <syzbot+a426cde6dee8c2884b0b@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Re: [syzbot] [ntfs3?] KASAN: slab-out-of-bounds Read in mi_enum_attr

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Subject: Re: [syzbot] [ntfs3?] KASAN: slab-out-of-bounds Read in mi_enum_attr
Author: lizhi.xu@...driver.com

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

diff --git a/fs/ntfs3/record.c b/fs/ntfs3/record.c
index 53629b1f65e9..a435df98c2b1 100644
--- a/fs/ntfs3/record.c
+++ b/fs/ntfs3/record.c
@@ -243,14 +243,14 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
 		off += asize;
 	}
 
-	asize = le32_to_cpu(attr->size);
-
 	/* Can we use the first field (attr->type). */
 	if (off + 8 > used) {
 		static_assert(ALIGN(sizeof(enum ATTR_TYPE), 8) == 8);
 		return NULL;
 	}
 
+	asize = le32_to_cpu(attr->size);
+
 	if (attr->type == ATTR_END) {
 		/* End of enumeration. */
 		return NULL;