From 271817a3e92c0455bda5856d87eca244ad67d3a2 Mon Sep 17 00:00:00 2001
From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date: Mon, 19 Oct 2015 17:23:28 -0400
Subject: [PATCH] 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>
---
crypto/asymmetric_keys/x509_public_key.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
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;