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Message-Id: <1454030348-17736-190-git-send-email-kamal@canonical.com>
Date: Thu, 28 Jan 2016 17:18:47 -0800
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Sasha Levin <sasha.levin@...cle.com>,
"David S. Miller" <davem@...emloft.net>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 189/210] net: sctp: prevent writes to cookie_hmac_alg from accessing invalid memory
3.19.8-ckt14 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Sasha Levin <sasha.levin@...cle.com>
[ Upstream commit 320f1a4a175e7cd5d3f006f92b4d4d3e2cbb7bb5 ]
proc_dostring() needs an initialized destination string, while the one
provided in proc_sctp_do_hmac_alg() contains stack garbage.
Thus, writing to cookie_hmac_alg would strlen() that garbage and end up
accessing invalid memory.
Fixes: 3c68198e7 ("sctp: Make hmac algorithm selection for cookie generation dynamic")
Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
net/sctp/sysctl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 2e9ada1..5b6e757 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -324,7 +324,7 @@ static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
struct ctl_table tbl;
bool changed = false;
char *none = "none";
- char tmp[8];
+ char tmp[8] = {0};
int ret;
memset(&tbl, 0, sizeof(struct ctl_table));
--
1.9.1
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