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

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Message-ID: <tencent_50A825E08D9F92025DEF5DE4992C4FB00D07@qq.com>
Date: Sat, 30 Dec 2023 16:08:35 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+65e940cfb8f99a97aca7@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] KASAN: slab-out-of-bounds Read in ntfs_listxattr (2)

please test slab-out-of-bounds Read in ntfs_listxattr

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git aafe7ad77b91

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index 4274b6f31cfa..3b97508a7bf2 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -219,6 +219,9 @@ static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
 		if (!ea->name_len)
 			break;
 
+		if (ea->name_len > ea_size)
+			break;
+
 		if (buffer) {
 			/* Check if we can use field ea->name */
 			if (off + ea_size > size)