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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 <eteo@redhat.com>.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2008-08-25 15:16:19 -07:00 committed by David S. Miller
parent f410a1fba7
commit 30c2235cbc
2 changed files with 9 additions and 0 deletions
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4
net/sctp/auth.c
View File

@ -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)

5
net/sctp/socket.c
View File

@ -3144,6 +3144,11 @@ 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;