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authorVlad Yasevich <vladislav.yasevich@hp.com>2008-08-27 22:41:52 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2008-09-08 03:20:21 -0700
commit1c6f8e1945a2b8317e5dad8fb5cfc882bd35b2b8 (patch)
tree56ff25c9c6de91c9cdff86593d882ae2be7c55a2
parenta1d348ddecaee92e74c27ccd69c325f4ce01d95f (diff)
sctp: add verification checks to SCTP_AUTH_KEY option
[ Upstream commit 30c2235cbc477d4629983d440cdc4f496fec9246 ] The structure used for SCTP_AUTH_KEY option contains a length that needs to be verfied to prevent buffer overflow conditions. Spoted by Eugene Teo <eteo@redhat.com>. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--net/sctp/auth.c4
-rw-r--r--net/sctp/socket.c5
2 files changed, 9 insertions, 0 deletions
diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index 675a5c3e68a6..1fcb4cf2f4c9 100644
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -80,6 +80,10 @@ static struct sctp_auth_bytes *sctp_auth_create_key(__u32 key_len, gfp_t gfp)
{
struct sctp_auth_bytes *key;
+ /* Verify that we are not going to overflow INT_MAX */
+ if ((INT_MAX - key_len) < sizeof(struct sctp_auth_bytes))
+ return NULL;
+
/* Allocate the shared key */
key = kmalloc(sizeof(struct sctp_auth_bytes) + key_len, gfp);
if (!key)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 7ceedee6a946..d9373c358ab2 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3072,6 +3072,11 @@ static int sctp_setsockopt_auth_key(struct sock *sk,
goto out;
}
+ if (authkey->sca_keylength > optlen) {
+ ret = -EINVAL;
+ goto out;
+ }
+
asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
ret = -EINVAL;