From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754526AbaDRJti (ORCPT ); Fri, 18 Apr 2014 05:49:38 -0400 Received: from ip4-83-240-18-248.cust.nbox.cz ([83.240.18.248]:45884 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751213AbaDRJWr (ORCPT ); Fri, 18 Apr 2014 05:22:47 -0400 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jiri Slaby , Tomas Cech , Corey Minyard , , Corey Minyard , Linus Torvalds Subject: [PATCH 3.12 08/72] Char: ipmi_bt_sm, fix infinite loop Date: Fri, 18 Apr 2014 11:21:41 +0200 Message-Id: <1070f32690efdfef2dc64183dded068ec54266c7.1397812482.git.jslaby@suse.cz> X-Mailer: git-send-email 1.9.2 In-Reply-To: <3389f243c528afc7c7300c83b8f296290cd3656d.1397812482.git.jslaby@suse.cz> References: <3389f243c528afc7c7300c83b8f296290cd3656d.1397812482.git.jslaby@suse.cz> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit a94cdd1f4d30f12904ab528152731fb13a812a16 upstream. In read_all_bytes, we do unsigned char i; ... bt->read_data[0] = BMC2HOST; bt->read_count = bt->read_data[0]; ... for (i = 1; i <= bt->read_count; i++) bt->read_data[i] = BMC2HOST; If bt->read_data[0] == bt->read_count == 255, we loop infinitely in the 'for' loop. Make 'i' an 'int' instead of 'char' to get rid of the overflow and finish the loop after 255 iterations every time. Signed-off-by: Jiri Slaby Reported-and-debugged-by: Rui Hui Dian Cc: Tomas Cech Cc: Corey Minyard Cc: Signed-off-by: Corey Minyard Signed-off-by: Linus Torvalds Signed-off-by: Jiri Slaby --- drivers/char/ipmi/ipmi_bt_sm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/ipmi/ipmi_bt_sm.c b/drivers/char/ipmi/ipmi_bt_sm.c index a22a7a502740..8156cafad11a 100644 --- a/drivers/char/ipmi/ipmi_bt_sm.c +++ b/drivers/char/ipmi/ipmi_bt_sm.c @@ -352,7 +352,7 @@ static inline void write_all_bytes(struct si_sm_data *bt) static inline int read_all_bytes(struct si_sm_data *bt) { - unsigned char i; + unsigned int i; /* * length is "framing info", minimum = 4: NetFn, Seq, Cmd, cCode. -- 1.9.2