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fix overflow bug, try2

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kojima
2002-11-08 17:05:35 +00:00
parent 60ee69979f
commit 811e508c84
1 changed files with 5 additions and 2 deletions
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7
wrlib/raster.c
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@@ -43,11 +43,14 @@ RImage*
RCreateImage(unsigned width, unsigned height, int alpha) RCreateImage(unsigned width, unsigned height, int alpha)
{ {
RImage *image=NULL; RImage *image=NULL;
unsigned bla1, bla2;
assert(width>0 && height>0); assert(width>0 && height>0);
/* check for too large images (cap on INT_MAX just to be sure :P) */ /* detect overflow (gr33tz to ruda :D) */
if (width > (INT_MAX/4)/height+4) { bla1 = width*height;
bla2 = bla1*4;
if (bla1/height != width || bla2/4 != bla1 || bla2 > INT_MAX-32) {
RErrorCode = RERR_NOMEMORY; RErrorCode = RERR_NOMEMORY;
return NULL; return NULL;
} }