On 05/13/13 09:41, Michael Shcwarcz wrote:
> Hello,
>
> I am running net-snmp 5.7.2 and it looks like there is a double free
> problem in snmptrapd, in free_trapd_address() and parse_trapd_address().
>
> I get a SIGABORT on the second SIGHUP (looks like it does a double free
> on the first SIGHUP and on the second it crashes).
>
> I have this snmptrapd.conf configuration:
>
> snmpTrapdAddr udp:162,udp6:162
>
> authCommunity log,execute,net public
>
> And this is the back-trace from gdb:
>
> *** glibc detected *** /opt/compass/bin/snmptrapd: free(): invalid next
> size (fast): 0x080c17a8 ***
>
> ======= Backtrace: =========
>
> /lib/libc.so.6[0xf7204845]
>
> /lib/libc.so.6(cfree+0x9c)[0xf72066ec]
>
> /opt/compass/bin/snmptrapd(free_trapd_address+0x2a)[0x804a6ba]
>
> /usr/lib/libnetsnmp.so.30(free_config+0x32)[0xf74ae4c2]
>
> /opt/compass/bin/snmptrapd[0x804a557]
>
> /opt/compass/bin/snmptrapd[0x804bfa9]
>
> /lib/libc.so.6(__libc_start_main+0xe5)[0xf71b0455]
>
> I have a patch that fixes this issue, here is the diff:
>
> @@ -446,6 +446,7 @@ free_trapd_address(void)
>
> {
>
> if (default_port != ddefault_port) {
>
> free(default_port);
>
> + default_port = ddefault_port;
>
> }
>
> }
>
> Tell me what you think about this solution..
Thanks for the patch and sorry for the delay. The above patch has been
checked in on the V5.7 and master branches.
Bart.
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