File 0001-P2P-Validate-SSID-element-length-before-co... of Package wpa_supplicant

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File 0001-P2P-Validate-SSID-element-length-before-copying-it-C.patch of Package wpa_supplicant (Revision 541aa8667281ab0394c5e9a2a77ef252)

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From 2674f84b8fb95d1b79f946e2c51e9d5173305085 Mon Sep 17 00:00:00 2001
From: Jouni Malinen <jouni@qca.qualcomm.com>
Date: Tue, 7 Apr 2015 11:32:11 +0300
Subject: [PATCH] P2P: Validate SSID element length before copying it
 (CVE-2015-1863)

This fixes a possible memcpy overflow for P2P dev->oper_ssid in
p2p_add_device(). The length provided by the peer device (0..255 bytes)
was used without proper bounds checking and that could have resulted in
arbitrary data of up to 223 bytes being written beyond the end of the
dev->oper_ssid[] array (of which about 150 bytes would be beyond the
heap allocation) when processing a corrupted management frame for P2P
peer discovery purposes.

This could result in corrupted state in heap, unexpected program
behavior due to corrupted P2P peer device information, denial of service
due to process crash, exposure of memory contents during GO Negotiation,
and potentially arbitrary code execution.

Thanks to Google security team for reporting this issue and smart
hardware research group of Alibaba security team for discovering it.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
---
 src/p2p/p2p.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/p2p/p2p.c b/src/p2p/p2p.c
index f584fae..a45fe73 100644
--- a/src/p2p/p2p.c
+++ b/src/p2p/p2p.c
@@ -778,6 +778,7 @@ int p2p_add_device(struct p2p_data *p2p, const u8 *addr, int freq,
 	if (os_memcmp(addr, p2p_dev_addr, ETH_ALEN) != 0)
 		os_memcpy(dev->interface_addr, addr, ETH_ALEN);
 	if (msg.ssid &&
+	    msg.ssid[1] <= sizeof(dev->oper_ssid) &&
 	    (msg.ssid[1] != P2P_WILDCARD_SSID_LEN ||
 	     os_memcmp(msg.ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN)
 	     != 0)) {
-- 
1.9.1

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