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authorOndrej Kozina <okozina@redhat.com>2014-08-25 11:49:54 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-14 09:00:11 -0800
commitd8325cceb317d5c83f117eda75c84f870cfa8c09 (patch)
tree3145c8353a06364b6e7cf5f570052295d0270d3a
parentda357d7aab5e47f5a9bd806980f4cbb1e76f523d (diff)
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crypto: algif - avoid excessive use of socket buffer in skcipher
commit e2cffb5f493a8b431dc87124388ea59b79f0bccb upstream. On archs with PAGE_SIZE >= 64 KiB the function skcipher_alloc_sgl() fails with -ENOMEM no matter what user space actually requested. This is caused by the fact sock_kmalloc call inside the function tried to allocate more memory than allowed by the default kernel socket buffer size (kernel param net.core.optmem_max). Signed-off-by: Ondrej Kozina <okozina@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--crypto/algif_skcipher.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index a19c027b29bd..83187f497c7c 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -49,7 +49,7 @@ struct skcipher_ctx {
struct ablkcipher_request req;
};
-#define MAX_SGL_ENTS ((PAGE_SIZE - sizeof(struct skcipher_sg_list)) / \
+#define MAX_SGL_ENTS ((4096 - sizeof(struct skcipher_sg_list)) / \
sizeof(struct scatterlist) - 1)
static inline int skcipher_sndbuf(struct sock *sk)