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

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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/)

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

Signed-off-by: Julien Brunel <brunel@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julien Brunel 2008-09-02 17:24:28 -07:00 committed by David S. Miller
parent 773b4e02be
commit 9d7d74029e
1 changed files with 2 additions and 4 deletions
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6
net/xfrm/xfrm_policy.c
View file

@ -1731,8 +1731,7 @@ int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
* 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 @@ int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
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;
}