linux-kernel - [PATCH 3.16 01/99] wireless: airo: potential buffer overflow in sprintf()

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Date:   Tue, 02 Apr 2019 14:38:27 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.16 01/99] wireless: airo: potential buffer overflow in
 sprintf()

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

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 3d39e1bb1c88f32820c5f9271f2c8c2fb9a52bac upstream.

It looks like we wanted to print a maximum of BSSList_rid.ssidLen bytes
of the ssid, but we accidentally use "%*s" (width) instead of "%.*s"
(precision) so if the ssid doesn't have a NUL terminator this could lead
to an overflow.

Static analysis.  Not tested.

Fixes: e174961ca1a0 ("net: convert print_mac to %pM")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/airo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -5469,7 +5469,7 @@ static int proc_BSSList_open( struct ino
            we have to add a spin lock... */
 	rc = readBSSListRid(ai, doLoseSync, &BSSList_rid);
 	while(rc == 0 && BSSList_rid.index != cpu_to_le16(0xffff)) {
-		ptr += sprintf(ptr, "%pM %*s rssi = %d",
+		ptr += sprintf(ptr, "%pM %.*s rssi = %d",
 			       BSSList_rid.bssid,
 				(int)BSSList_rid.ssidLen,
 				BSSList_rid.ssid,