From: Russell King Subject: [PATCH 3/3] crypto: marvell: initialise struct mv_cesa_ahash_req Date: Fri, 09 Oct 2015 11:29:55 +0100 Message-ID: References: <20151009102904.GL32532@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Cc: "David S. Miller" , Herbert Xu , linux-crypto@vger.kernel.org To: Thomas Petazzoni Return-path: Received: from pandora.arm.linux.org.uk ([78.32.30.218]:50060 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965448AbbJIK37 (ORCPT ); Fri, 9 Oct 2015 06:29:59 -0400 In-Reply-To: <20151009102904.GL32532@n2100.arm.linux.org.uk> Content-Disposition: inline Sender: linux-crypto-owner@vger.kernel.org List-ID: 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 --- drivers/crypto/marvell/hash.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/crypto/marvell/hash.c b/drivers/crypto/marvell/hash.c index a259aced3b42..699839816505 100644 --- a/drivers/crypto/marvell/hash.c +++ b/drivers/crypto/marvell/hash.c @@ -831,6 +831,8 @@ static int mv_cesa_md5_import(struct ahash_request *req, const void *in) unsigned int cache_ptr; int ret; + memset(creq, 0, sizeof(*creq)); + creq->len = in_state->byte_count; memcpy(creq->state, in_state->hash, digsize); creq->cache_ptr = 0; @@ -921,6 +923,8 @@ static int mv_cesa_sha1_import(struct ahash_request *req, const void *in) unsigned int cache_ptr; int ret; + memset(creq, 0, sizeof(*creq)); + creq->len = in_state->count; memcpy(creq->state, in_state->state, digsize); creq->cache_ptr = 0; @@ -1022,6 +1026,8 @@ static int mv_cesa_sha256_import(struct ahash_request *req, const void *in) unsigned int cache_ptr; int ret; + memset(creq, 0, sizeof(*creq)); + creq->len = in_state->count; memcpy(creq->state, in_state->state, digsize); creq->cache_ptr = 0; -- 2.1.0