[Vortex] Bug: double free of vortex_ctx

Francis Brosnan Blazquez francis at aspl.es
Tue Jan 15 13:43:05 CET 2008

Hi Jens,

> There seems to be a bug in vortex.c that causes the vortex_ctx to be  
> freed twice if vortex_dtds_init fails. I discovered this due to a  
> double-free warning from malloc. The sequence of events is:
> - vortex_init calls vortex_init_ctx
>         - vortex_init_ctx calls vortex_dtds_init
>                 - that function returns false
>         - so vortex_init_ctx calls vortex_ctx_free (vortex.c:899) and
> returns  
> false
> - vortex_init calls vortex_ctx_free again (vortex.c:793)

You are right, there is a double free bug on dtd loading failure....

> My guess is that the line vortex.c:899 should be deleted, because  
> there are other paths out of that function that return false but do  
> not free the context.

Yes, that line must be deleted because vortex_init_ctx should call to
free the context received. 

I've updated the file to avoid doing so. Thanks for reporting Jens!

> (The line numbers are from SVN rev 3194.)
> --Jens
Francis Brosnan Blazquez <francis at aspl.es>
Advanced Software Production Line, S.L.

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