[sldev] [VWR] OpenJPEG backtraces

[Robin Cornelius]

Robin Cornelius wrote:
> 
> (gdb) bt
> #0  0x0000000001dcb476 in dwt_interleave_h (h=0x41801b90, a=0xff6a0f0) 
> at libopenjpeg/dwt.c:166
> #1  0x0000000001dcdfaf in dwt_decode_tile (tilec=0x845ede0, stop=0, 

Looking at frame #1 i've found the problem

in dwt.c line 623 we have pointer truncation

h.mem = v.mem = (int*)( (unsigned)m + 16 - ( (unsigned)m % 16 ) ) ;

I've checked the contents of h and m using the gdb console and with the 
(unsigned) cast you get a bogus memory location and with a (unsigned 
long) cast you get the intended memory location

64bit systems only

I'm not sure what the correct portable correct version is to make a 
patch thats good for 32 and 64 systems.

Robin