[riot-notifications] [RIOT-OS/RIOT] gnrc_tftp: Fix out-of-bounds memory access when comparing modes (#11737)

nmeum notifications at github.com
Thu Jun 27 10:26:55 CEST 2019

nmeum commented on this pull request.

> @@ -233,7 +233,7 @@ static tftp_state _tftp_send_error(tftp_context_t *ctxt, gnrc_pktsnip_t *buf, tf
 static tftp_state _tftp_send(gnrc_pktsnip_t *buf, tftp_context_t *ctxt, size_t len);
 /* decode the default TFTP start packet */
-static int _tftp_decode_start(tftp_context_t *ctxt, uint8_t *buf, gnrc_pktsnip_t *outbuf);
+static int _tftp_decode_start(tftp_context_t *ctxt, uint8_t *buf, size_t len, gnrc_pktsnip_t *outbuf);

Changed the function parameter to contain a single input `gnrc_pktsnip_t*` instead of passing a buffer and length information separately. 

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