Author: glebius
Date: Tue Apr 25 15:56:46 2017
New Revision: 317409
URL: https://svnweb.freebsd.org/changeset/base/317409
Log:
Cherry-pick 5d3c5151c2b885aab36627bafb8539238da27b2d, it fixes use after free
if tcpdump(1) is run on non-existent interface.
Suggested by: zeising
Modified:
head/contrib/tcpdump/tcpdump.c
Modified: head/contrib/tcpdump/tcpdump.c
==============================================================================
--- head/contrib/tcpdump/tcpdump.c Tue Apr 25 13:17:34 2017
(r317408)
+++ head/contrib/tcpdump/tcpdump.c Tue Apr 25 15:56:46 2017
(r317409)
@@ -1085,9 +1085,9 @@ open_interface(const char *device, netdi
/*
* Return an error for our caller to handle.
*/
- pcap_close(pc);
snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s\n(%s)",
device, pcap_statustostr(status), cp);
+ pcap_close(pc);
return (NULL);
} else if (status == PCAP_ERROR_PERM_DENIED && *cp != '\0')
error("%s: %s\n(%s)", device,
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