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authorSowmini Varadhan <sowmini.varadhan@oracle.com>2015-10-20 00:23:28 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2015-10-20 17:14:01 +0300
commit271817a3e92c0455bda5856d87eca244ad67d3a2 (patch)
tree6fe9c083b7ba5ba16a2f020ebe2ac69436fe8f63
parent381ceef785aa3957cd78f13b9311a09a8ea8ed45 (diff)
downloadlinux-271817a3e92c0455bda5856d87eca244ad67d3a2.tar.xz
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>
-rw-r--r--crypto/asymmetric_keys/x509_public_key.c5
1 files 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;