linux-kernel - [PATCH 3.2 89/94] Char: ipmi_bt

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Date:	Mon, 28 Apr 2014 02:11:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"" <openipmi-developer@...ts.sourceforge.net>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Jiri Slaby" <jslaby@...e.cz>, "Corey Minyard" <minyard@....org>,
	"Tomas Cech" <tcech@...e.cz>, "Corey Minyard" <cminyard@...sta.com>
Subject: [PATCH 3.2 89/94] Char: ipmi_bt_sm, fix infinite loop

3.2.58-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jiri Slaby <jslaby@...e.cz>

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 <jslaby@...e.cz>
Reported-and-debugged-by: Rui Hui Dian <rhdian@...ell.com>
Cc: Tomas Cech <tcech@...e.cz>
Cc: Corey Minyard <minyard@....org>
Cc: <openipmi-developer@...ts.sourceforge.net>
Signed-off-by: Corey Minyard <cminyard@...sta.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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 f5e4cd7..61e7161 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.

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