From: Ondrej Kozina Date: Mon, 25 Aug 2014 09:49:54 +0000 (+0200) Subject: crypto: algif - avoid excessive use of socket buffer in skcipher X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=591189c21235f0c2884cfae24b65ecfb5e120325;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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 Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- 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)