linux-kernel - [PATCH 5.3 307/344] ovl: Fix dereferencing possible ERR

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Date:   Thu,  3 Oct 2019 17:54:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ding Xiang <dingxiang@...s.chinamobile.com>,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: [PATCH 5.3 307/344] ovl: Fix dereferencing possible ERR_PTR()

From: Ding Xiang <dingxiang@...s.chinamobile.com>

commit 97f024b9171e74c4443bbe8a8dce31b917f97ac5 upstream.

if ovl_encode_real_fh() fails, no memory was allocated
and the error in the error-valued pointer should be returned.

Fixes: 9b6faee07470 ("ovl: check ERR_PTR() return value from ovl_encode_fh()")
Signed-off-by: Ding Xiang <dingxiang@...s.chinamobile.com>
Cc: <stable@...r.kernel.org> # v4.16+
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/overlayfs/export.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/overlayfs/export.c
+++ b/fs/overlayfs/export.c
@@ -227,9 +227,8 @@ static int ovl_d_to_fh(struct dentry *de
 	/* Encode an upper or lower file handle */
 	fh = ovl_encode_real_fh(enc_lower ? ovl_dentry_lower(dentry) :
 				ovl_dentry_upper(dentry), !enc_lower);
-	err = PTR_ERR(fh);
 	if (IS_ERR(fh))
-		goto fail;
+		return PTR_ERR(fh);
 
 	err = -EOVERFLOW;
 	if (fh->len > buflen)