From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date: Mon, 19 Oct 2015 21:23:28 +0000 (-0400)
Subject: crypto: asymmetric_keys - Fix unaligned access in x509_get_sig_params()
X-Git-Tag: KARO-TX6UL-2015-11-03~86^2
X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-linux.git;a=commitdiff_plain;h=271817a3e92c0455bda5856d87eca244ad67d3a2;ds=inline

crypto: asymmetric_keys - Fix unaligned access in x509_get_sig_params()

x509_get_sig_params() has the same code pattern as the one in
pkcs7_verify() that is fixed by commit 62f57d05e287 ("crypto: pkcs7 - Fix
unaligned access in pkcs7_verify()") so apply a similar fix here: make
sure that desc is pointing at an algined value past the digest_size,
and take alignment values into consideration when doing kzalloc()

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index 6d88dd15c98d..6451d1848a7d 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -194,14 +194,15 @@ int x509_get_sig_params(struct x509_certificate *cert)
 	 * digest storage space.
 	 */
 	ret = -ENOMEM;
-	digest = kzalloc(digest_size + desc_size, GFP_KERNEL);
+	digest = kzalloc(ALIGN(digest_size, __alignof__(*desc)) + desc_size,
+			 GFP_KERNEL);
 	if (!digest)
 		goto error;
 
 	cert->sig.digest = digest;
 	cert->sig.digest_size = digest_size;
 
-	desc = digest + digest_size;
+	desc = PTR_ALIGN(digest + digest_size, __alignof__(*desc));
 	desc->tfm = tfm;
 	desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;