From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:57536 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755346AbeDFNc0 (ORCPT ); Fri, 6 Apr 2018 09:32:26 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eli Cooper , Herbert Xu Subject: [PATCH 4.4 51/72] crypto: ahash - Fix early termination in hash walk Date: Fri, 6 Apr 2018 15:23:52 +0200 Message-Id: <20180406084309.497760494@linuxfoundation.org> In-Reply-To: <20180406084305.210085169@linuxfoundation.org> References: <20180406084305.210085169@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Herbert Xu commit 900a081f6912a8985dc15380ec912752cb66025a upstream. When we have an unaligned SG list entry where there is no leftover aligned data, the hash walk code will incorrectly return zero as if the entire SG list has been processed. This patch fixes it by moving onto the next page instead. Reported-by: Eli Cooper Cc: Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- crypto/ahash.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/crypto/ahash.c +++ b/crypto/ahash.c @@ -91,13 +91,14 @@ int crypto_hash_walk_done(struct crypto_ if (nbytes && walk->offset & alignmask && !err) { walk->offset = ALIGN(walk->offset, alignmask + 1); - walk->data += walk->offset; - nbytes = min(nbytes, ((unsigned int)(PAGE_SIZE)) - walk->offset); walk->entrylen -= nbytes; - return nbytes; + if (nbytes) { + walk->data += walk->offset; + return nbytes; + } } if (walk->flags & CRYPTO_ALG_ASYNC)