linux-kernel - [PATCH] fs: hfsplus: fix uninit-value bug in hfsplus

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Date:   Wed, 10 May 2023 10:25:15 +0800
From:   houweitao <houweitao@...iglobal.com>
To:     <akpm@...ux-foudation.org>, <houweitao@...iglobal.com>,
        <xupengfei@...china.com>, <brauner@...nel.org>,
        <dchinner@...hat.com>
CC:     <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <royliyueyi@...iglobal.com>
Subject: [PATCH] fs: hfsplus: fix uninit-value bug in hfsplus_listxattr

BUG: KMSAN: uninit-value in strncmp+0x11e/0x180 lib/string.c:307
 strncmp+0x11e/0x180 lib/string.c:307
 is_known_namespace fs/hfsplus/xattr.c:45 [inline]
 name_len fs/hfsplus/xattr.c:397 [inline]
 hfsplus_listxattr+0xe61/0x1aa0 fs/hfsplus/xattr.c:746
 vfs_listxattr fs/xattr.c:473 [inline]
 listxattr+0x700/0x780 fs/xattr.c:820
 path_listxattr fs/xattr.c:844 [inline]
 __do_sys_llistxattr fs/xattr.c:862 [inline]
 __se_sys_llistxattr fs/xattr.c:859 [inline]
 __ia32_sys_llistxattr+0x171/0x300 fs/xattr.c:859
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Reported-by: syzbot <syzbot+92ef9ee419803871020e@...kaller.appspotmail.com>
Link: https://syzkaller.appspot.com/bug?extid=92ef9ee419803871020e
Signed-off-by: houweitao <houweitao@...iglobal.com>
---
 fs/hfsplus/xattr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c
index 58021e73c00b..f7f9d0889df3 100644
--- a/fs/hfsplus/xattr.c
+++ b/fs/hfsplus/xattr.c
@@ -698,7 +698,7 @@ ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
 		return err;
 	}
 
-	strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
+	strbuf = kzalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
 			XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
 	if (!strbuf) {
 		res = -ENOMEM;
-- 
2.17.1