Re: Possible BUG on net/ipv4/ipcomp.c, line 358 (fwd)

[Herbert Xu <herbert@gondor.apana.org.au>]

On Wed, Nov 07, 2007 at 07:51:57AM +1100, James Morris wrote:
>
> ---------- Forwarded message ----------
> Date: Tue, 06 Nov 2007 14:53:30 +0100
> From: Vicenç <vbeltran@ac.upc.edu>
> To: jmorris@intercode.com.au
> Subject: Possible BUG on net/ipv4/ipcomp.c, line 358
> 
> Hi James,
> 
> I think there is a bug on net/ipv4/ipcomp.c line 358. The trivial patch that
> should fix it is:

Thanks for the report! The same bug exists in IPv6 too and
this patch should fix both.

[IPSEC]: Fix crypto_alloc_comp error checking

The function crypto_alloc_comp returns an errno instead of NULL
to indicate error.  So it needs to be tested with IS_ERR.

This is based on a patch by Vicenç Beltran Querol.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Cheers,
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diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index ca1b5fd..2c44a94 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <asm/semaphore.h>
 #include <linux/crypto.h>
+#include <linux/err.h>
 #include <linux/pfkeyv2.h>
 #include <linux/percpu.h>
 #include <linux/smp.h>
@@ -344,7 +345,7 @@ static struct crypto_comp **ipcomp_alloc_tfms(const char *alg_name)
 	for_each_possible_cpu(cpu) {
 		struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
 							    CRYPTO_ALG_ASYNC);
-		if (!tfm)
+		if (IS_ERR(tfm))
 			goto error;
 		*per_cpu_ptr(tfms, cpu) = tfm;
 	}
diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index 85eb479..0cd4056 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -36,6 +36,7 @@
 #include <net/ipcomp.h>
 #include <asm/semaphore.h>
 #include <linux/crypto.h>
+#include <linux/err.h>
 #include <linux/pfkeyv2.h>
 #include <linux/random.h>
 #include <linux/percpu.h>
@@ -358,7 +359,7 @@ static struct crypto_comp **ipcomp6_alloc_tfms(const char *alg_name)
 	for_each_possible_cpu(cpu) {
 		struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
 							    CRYPTO_ALG_ASYNC);
-		if (!tfm)
+		if (IS_ERR(tfm))
 			goto error;
 		*per_cpu_ptr(tfms, cpu) = tfm;
 	}