linux-kernel - [PATCH 3.16 065/328] xfrm: fix 'passing zero to ERR

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Message-ID: <lsq.1544392233.865669722@decadent.org.uk>
Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Steffen Klassert" <steffen.klassert@...unet.com>,
        "YueHaibing" <yuehaibing@...wei.com>
Subject: [PATCH 3.16 065/328] xfrm: fix 'passing zero to ERR_PTR()' warning

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: YueHaibing <yuehaibing@...wei.com>

commit 934ffce1343f22ed5e2d0bd6da4440f4848074de upstream.

Fix a static code checker warning:

  net/xfrm/xfrm_policy.c:1836 xfrm_resolve_and_create_bundle() warn: passing zero to 'ERR_PTR'

xfrm_tmpl_resolve return 0 just means no xdst found, return NULL
instead of passing zero to ERR_PTR.

Fixes: d809ec895505 ("xfrm: do not assume that template resolving always returns xfrms")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/xfrm/xfrm_policy.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1692,7 +1692,10 @@ xfrm_resolve_and_create_bundle(struct xf
 	/* Try to instantiate a bundle */
 	err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
 	if (err <= 0) {
-		if (err != 0 && err != -EAGAIN)
+		if (err == 0)
+			return NULL;
+
+		if (err != -EAGAIN)
 			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
 		return ERR_PTR(err);
 	}