From 30c2235cbc477d4629983d440cdc4f496fec9246 Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Mon, 25 Aug 2008 15:16:19 -0700 Subject: sctp: add verification checks to SCTP_AUTH_KEY option 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 . Signed-off-by: Vlad Yasevich Signed-off-by: David S. Miller --- net/sctp/auth.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'net/sctp/auth.c') diff --git a/net/sctp/auth.c b/net/sctp/auth.c index 675a5c3e68a..1fcb4cf2f4c 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) -- cgit v1.2.3