From e72f407ee793f1455051cfa834e758afca09e4f6 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 9 Oct 2015 20:43:43 +0100 Subject: [PATCH] crypto: marvell/cesa - initialise struct mv_cesa_ahash_req When a AF_ALG fd is accepted a second time (hence hash_accept() is used), hash_accept_parent() allocates a new private context using sock_kmalloc(). This context is uninitialised. After use of the new fd, we eventually end up with the kernel complaining: marvell-cesa f1090000.crypto: dma_pool_free cesa_padding, c0627770/0 (bad dma) where c0627770 is a random address. Poisoning the memory allocated by the above sock_kmalloc() produces kernel oopses within the marvell hash code, particularly the interrupt handling. The following simplfied call sequence occurs: hash_accept() crypto_ahash_export() marvell hash export function af_alg_accept() hash_accept_parent() <== allocates uninitialised struct hash_ctx crypto_ahash_import() marvell hash import function hash_ctx contains the struct mv_cesa_ahash_req in its req.__ctx member, and, as the marvell hash import function only partially initialises this structure, we end up with a lot of members which are left with whatever data was in memory prior to sock_kmalloc(). Add zero-initialisation of this structure. Signed-off-by: Russell King Acked-by: Boris Brezillon Signed-off-by: Herbert Xu --- drivers/crypto/marvell/hash.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/crypto/marvell/hash.c b/drivers/crypto/marvell/hash.c index aa18324d09e3..13bbf7cea072 100644 --- a/drivers/crypto/marvell/hash.c +++ b/drivers/crypto/marvell/hash.c @@ -833,6 +833,10 @@ static int mv_cesa_md5_import(struct ahash_request *req, const void *in) unsigned int cache_ptr; int ret; + ret = crypto_ahash_init(req); + if (ret) + return ret; + creq->len = in_state->byte_count; memcpy(creq->state, in_state->hash, digsize); creq->cache_ptr = 0; @@ -923,6 +927,10 @@ static int mv_cesa_sha1_import(struct ahash_request *req, const void *in) unsigned int cache_ptr; int ret; + ret = crypto_ahash_init(req); + if (ret) + return ret; + creq->len = in_state->count; memcpy(creq->state, in_state->state, digsize); creq->cache_ptr = 0; @@ -1024,6 +1032,10 @@ static int mv_cesa_sha256_import(struct ahash_request *req, const void *in) unsigned int cache_ptr; int ret; + ret = crypto_ahash_init(req); + if (ret) + return ret; + creq->len = in_state->count; memcpy(creq->state, in_state->state, digsize); creq->cache_ptr = 0; -- 2.30.2