[Clamav-devel] Wrong type for memory allocation calculation
ian at ianshome.com
Mon Feb 24 03:08:36 EST 2014
I'm new here, so please forgive me if I'm posting to the wrong list!
I think have found a bug in fmap.c which causes a crash when scanning a
large file in a 64 bit build.
The function cl_fmap_open_handle uses an unsigned for mapsz (line 213),
and then calculates the size (line 232) with
mapsz = pages * pgsz + hdrsz;
Where I had a crash, pages was 1047561, pgsz was 4096 and hdrsz was
4194304, so the result (4,295,004,160) overflowed an unsigned.
These variables should be size_t (the correct size type for mmap).
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