SIGFPE / Division by zero in mapio.c

[fake]

when rendering jpegs from a raster, for some reason i have yet to determine, in a call to msIO_fwrite, size is 0. this causes a division by zero at the method's return statement:

             return msIO_contextWrite( context, data, size * nmemb ) / size;

this is line 457 in trunk (rev. 12907).

it would be wise to check if size is 0 before dividing by it, right?

[warmerdam]

Patched in trunk (r12908) in both read and write cases.

It is hard for me to judge if this is serious enough to back port or not.

[sdlime]

Probably should be patched in the 6.0 and 5.6 branches since it's such an easy fix. We'll likely see releases in both of those again.

Steve