Check for packets bigger than WTAP_MAX_PACKET_SIZE.

Change-Id: Ia932f3e5aeaca7a566ea9f00ce1dca1a2071a1a4
Reviewed-on: https://code.wireshark.org/review/15187
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 11 insertions, 0 deletions

diff --git a/wiretap/vms.c b/wiretap/vms.c
index ebcfefb78c..2133c7802d 100644
--- a/wiretap/vms.c
+++ b/wiretap/vms.c
@@ -390,6 +390,17 @@ parse_vms_packet(FILE_T fh, struct wtap_pkthdr *phdr, Buffer *buf, int *err, gch
             break;
         }
     } while (! isdumpline(line));
+    if (pkt_len > WTAP_MAX_PACKET_SIZE) {
+        /*
+         * Probably a corrupt capture file; return an error,
+         * so that our caller doesn't blow up trying to allocate
+         * space for an immensely-large packet.
+         */
+        *err = WTAP_ERR_BAD_FILE;
+        *err_info = g_strdup_printf("vms: File has %u-byte packet, bigger than maximum of %u",
+                                    pkt_len, WTAP_MAX_PACKET_SIZE);
+        return FALSE;
+    }
 
     p = strstr(months, mon);
     if (p)