linux-kernel - [07/50] si4713-i2c: avoid potential buffer overflow on si4713

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Date:	Fri, 05 Aug 2011 17:03:25 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Sakari Ailus <sakari.ailus@...well.research.nokia.com>,
	Eduardo Valentin <edubezval@...il.com>
Subject: [07/50] si4713-i2c: avoid potential buffer overflow on si4713

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

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

From: Mauro Carvalho Chehab <mchehab@...hat.com>

commit dc6b845044ccb7e9e6f3b7e71bd179b3cf0223b6 upstream.

While compiling it with Fedora 15, I noticed this issue:

  inlined from ‘si4713_write_econtrol_string’ at drivers/media/radio/si4713-i2c.c:1065:24:
  arch/x86/include/asm/uaccess_32.h:211:26: error: call to ‘copy_from_user_overflow’ declared with attribute error: copy_from_user() buffer size is not provably correct

Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Acked-by: Sakari Ailus <sakari.ailus@...well.research.nokia.com>
Acked-by: Eduardo Valentin <edubezval@...il.com>
Reviewed-by: Eugene Teo <eugeneteo@...nel.sg>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/media/radio/si4713-i2c.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/media/radio/si4713-i2c.c
+++ b/drivers/media/radio/si4713-i2c.c
@@ -1003,7 +1003,7 @@ static int si4713_write_econtrol_string(
 		char ps_name[MAX_RDS_PS_NAME + 1];
 
 		len = control->size - 1;
-		if (len > MAX_RDS_PS_NAME) {
+		if (len < 0 || len > MAX_RDS_PS_NAME) {
 			rval = -ERANGE;
 			goto exit;
 		}
@@ -1025,7 +1025,7 @@ static int si4713_write_econtrol_string(
 		char radio_text[MAX_RDS_RADIO_TEXT + 1];
 
 		len = control->size - 1;
-		if (len > MAX_RDS_RADIO_TEXT) {
+		if (len < 0 || len > MAX_RDS_RADIO_TEXT) {
 			rval = -ERANGE;
 			goto exit;
 		}


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