Catch OverflowError (#4529)

Author: guedou

scapy/utils.py

@@ -1500,7 +1500,14 @@ def _read_packet(self, size=MTU):
         if len(hdr) < 16:
             raise EOFError
         sec, usec, caplen, wirelen = struct.unpack(self.endian + "IIII", hdr)
-        return (self.f.read(caplen)[:size],
+
+        try:
+            data = self.f.read(caplen)[:size]
+        except OverflowError as e:
+            warning(f"Pcap: {e}")
+            raise EOFError
+
+        return (data,
                 RawPcapReader.PacketMetadata(sec=sec, usec=usec,
                                              wirelen=wirelen, caplen=caplen))
 

test/regression.uts

@@ -2343,6 +2343,11 @@ file = BytesIO(b"\xd4\xc3\xb2\xa1\x02\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x0
 l = rdpcap(file)
 assert l[0][LDAP].summary() == "LDAP"
 
+# Issue #69628 - 32-bit alternative
+file = BytesIO(b'\xd4\xc3\xb2\xa1\x02\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\x01\x00\x00\x00%\xa8\xddfK\x1b\x05\x00\xca\xca\xca\xca*\x00\x00\x00\xff\xff\xff\xff\xff\xff\x86"\x11&\xab3\x08\x06\x00\x01\x08\x00\x06\x04\x00\x01]\x80\x0f\x13*r\n\x00\x02\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+l = rdpcap(file)
+assert len(l) == 0 or ARP in l[0]
+
 = Read a pcap file with wirelen != captured len
 pktpcapwirelen = rdpcap(pcapwirelenfile)