[PATCH 3.14 38/59] net: sctp: prevent writes to cookie_hmac_alg from accessing invalid memory

Greg Kroah-Hartman
2016-01-27T19:49:59Z

From: Sasha Levin <sasha.levin@oracle.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@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/sctp/sysctl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -310,7 +310,7 @@ static int proc_sctp_do_hmac_alg(struct
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));