linux-kernel - [PATCH 3.2 015/110] staging: rtl8712: prevent buffer overrun in recvbuf2recvframe

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Message-ID: <lsq.1439201550.210235958@decadent.org.uk>
Date:	Mon, 10 Aug 2015 12:12:30 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Larry Finger" <Larry.Finger@...inger.net>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"Haggai Eran" <haggai.eran@...il.com>
Subject: [PATCH 3.2 015/110] staging: rtl8712: prevent buffer overrun in
 recvbuf2recvframe

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

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

From: Haggai Eran <haggai.eran@...il.com>

commit cab462140f8a183e3cca0b51c8b59ef715cb6148 upstream.

With an RTL8191SU USB adaptor, sometimes the hints for a fragmented
packet are set, but the packet length is too large. Allocate enough
space to prevent memory corruption and a resulting kernel panic [1].

[1] http://www.spinics.net/lists/linux-wireless/msg136546.html

Signed-off-by: Haggai Eran <haggai.eran@...il.com>
ACKed-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/rtl8712/rtl8712_recv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/staging/rtl8712/rtl8712_recv.c
+++ b/drivers/staging/rtl8712/rtl8712_recv.c
@@ -1076,7 +1076,8 @@ static int recvbuf2recvframe(struct _ada
 		/* for first fragment packet, driver need allocate 1536 +
 		 * drvinfo_sz + RXDESC_SIZE to defrag packet. */
 		if ((mf == 1) && (frag == 0))
-			alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
+			/*1658+6=1664, 1664 is 128 alignment.*/
+			alloc_sz = max_t(u16, tmp_len, 1658);
 		else
 			alloc_sz = tmp_len;
 		/* 2 is for IP header 4 bytes alignment in QoS packet case.

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