From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755786Ab3LTKUR (ORCPT ); Fri, 20 Dec 2013 05:20:17 -0500 Received: from mail-pb0-f46.google.com ([209.85.160.46]:33305 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754781Ab3LTKUO (ORCPT ); Fri, 20 Dec 2013 05:20:14 -0500 From: Wenliang Fan To: dan.carpenter@oracle.com, gregkh@linuxfoundation.org, klmckinney1@gmail.com, tulinizer@gmail.com Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Wenliang Fan Subject: [PATCH] drivers/staging/bcm: Integer overflow Date: Fri, 20 Dec 2013 18:19:56 +0800 Message-Id: <1387534796-31901-1-git-send-email-fanwlexca@gmail.com> X-Mailer: git-send-email 1.8.5.rc1.28.g7061504 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The checking condition in 'validateFlash2xReadWrite()' is not sufficient. A large number invalid would cause an integer overflow and pass the condition, which could cause further integer overflows in 'Bcmchar.c:bcm_char_ioctl()'. Signed-off-by: Wenliang Fan --- drivers/staging/bcm/nvm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/staging/bcm/nvm.c b/drivers/staging/bcm/nvm.c index 9e5f955..7f3dd4b 100644 --- a/drivers/staging/bcm/nvm.c +++ b/drivers/staging/bcm/nvm.c @@ -3944,6 +3944,11 @@ int validateFlash2xReadWrite(struct bcm_mini_adapter *Adapter, struct bcm_flash2 BCM_DEBUG_PRINT(Adapter, DBG_TYPE_OTHERS, NVM_RW, DBG_LVL_ALL, "End offset :%x\n", uiSectEndOffset); + /* psFlash2xReadWrite->offset and uiNumOfBytes are user controlled and can lead to integer overflows */ + if (uiSectStartOffset + psFlash2xReadWrite->offset < uiSectStartOffset) + return false; + if (uiSectStartOffset + psFlash2xReadWrite->offset + uiNumOfBytes < uiNumOfBytes) + return false; /* Checking the boundary condition */ if ((uiSectStartOffset + psFlash2xReadWrite->offset + uiNumOfBytes) <= uiSectEndOffset) return TRUE; -- 1.8.5.rc1.28.g7061504