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Improve input validation when processing AUTH chunks.

Browse Source 
Thanks to Natalie Silvanovich from Google for finding and reporting the
issue found by her in the SCTP userland stack.

MFC after:		3 days
X-MFC with:		https://svnweb.freebsd.org/changeset/base/360193
This commit is contained in:
Michael Tuexen 2020-04-22 21:22:33 +00:00
parent 69a3eb6223
commit 8262311cbe
1 changed files with 9 additions and 7 deletions
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16
sys/netinet/sctp_input.c
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@ -2094,7 +2094,7 @@ sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
int init_offset, initack_offset, initack_limit;
int retval;
int error = 0;
uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
struct socket *so;
@ -2273,7 +2273,7 @@ sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
if (auth_skipped) {
struct sctp_auth_chunk *auth;
if (auth_len <= SCTP_PARAM_BUFFER_SIZE) {
if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
} else {
auth = NULL;
@ -4670,11 +4670,13 @@ sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
if (auth_skipped && (stcb != NULL)) {
struct sctp_auth_chunk *auth;
auth = (struct sctp_auth_chunk *)
sctp_m_getptr(m, auth_offset,
auth_len, chunk_buf);
got_auth = 1;
auth_skipped = 0;
if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
got_auth = 1;
auth_skipped = 0;
} else {
auth = NULL;
}
if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
auth_offset)) {
/* auth HMAC failed so dump it */