net/xfrm: Use an IS_ERR test rather than a NULL test

Author: Julien Brunel <brunel@diku.dk>

In case of error, the function xfrm_bundle_create returns an ERR
pointer, but never returns a NULL pointer. So a NULL test that comes
after an IS_ERR test should be deleted.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// 
@match_bad_null_test@
expression x, E;
statement S1,S2;
@@
x =  xfrm_bundle_create(...)
... when != x = E
*  if (x != NULL) 
S1 else S2
// 

Signed-off-by: Julien Brunel 
Signed-off-by: Julia Lawall 
Signed-off-by: David S. Miller

---
 net/xfrm/xfrm_policy.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
 
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 841b32a..46914b7 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1731,8 +1731,7 @@ restart:
 			 * We can't enlist stable bundles either.
 			 */
 			write_unlock_bh(&policy->lock);
-			if (dst)
-				dst_free(dst);
+			dst_free(dst);
 
 			if (pol_dead)
 				XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD);
@@ -1748,8 +1747,7 @@ restart:
 			err = xfrm_dst_update_origin(dst, fl);
 		if (unlikely(err)) {
 			write_unlock_bh(&policy->lock);
-			if (dst)
-				dst_free(dst);
+			dst_free(dst);
 			XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
 			goto error;
 		}

net/xfrm: Use an IS_ERR test rather than a NULL test

qlambert

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