Wireshark · Ethereal-dev: Re: [Ethereal-dev] Segfault when applying a WEP key to decrypt traffic

[Guy Harris <gharris@xxxxxxxxx>]

Joshua Wright wrote:
> I'm experiencing a segfault with Ethereal from SVN as of this morning. 
> When I apply a 40-bit WEP key and change the key index count to apply 
> the key, Ethereal segfaults.

There's a bug in the preferences code that, when applying preference 
changes, can cause a packet redissection to be performed before the 
dissectors have been notified that their preferences have changed.  This 
means that a dissector's internal data structures could be in an 
inconsistent state - in particular, the 802.11 dissector could have had 
its count of WEP keys increased, as that's a directly-registered 
preference, but it might not've been called to allocate the table of WEP 
keys, if necessary, and set the numerical values of those keys from the 
string preferences - when it's called to dissect a packet.

I've checked in a fix.