[BusyBox] httpd segfault

[Pete Flugstad]

Hello,

   I'm running into a segfault with httpd.  I tracked this down to the 
config->referer handling.

   Specifically, if a request comes in that has a referrer in it, then 
config->referer is strdup'd to create a new string representing that 
value, in handleIncoming.  Later when handleIncoming is done, this 
buffer is freed, but the config->referer pointer is NOT zero'd.

   If another request comes in after that, without a referer line, then 
the old config->referer pointer is free'd again, probably causing a 
segfault (at least it does on my system).

   The solution is to simply zero the config->referer pointer at the 
bottom of the handleIncoming function.

Pete Flugstad

PS: caught this with ElectricFence - all hail Electric Fence!!!