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argh! buffer overflow fix, try 3 :P

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This commit is contained in:
kojima
2002-11-08 18:00:56 +00:00
parent 811e508c84
commit 55f3cb9577
1 changed files with 12 additions and 1 deletions
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13
wrlib/raster.c
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@@ -49,8 +49,18 @@ RCreateImage(unsigned width, unsigned height, int alpha)
/* detect overflow (gr33tz to ruda :D) */
bla1 = width*height;
if (bla1 / height != width) {
RErrorCode = RERR_NOMEMORY;
return NULL;
}
bla2 = bla1*4;
if (bla1/height != width || bla2/4 != bla1 || bla2 > INT_MAX-32) {
if (bla2/4 != bla1) {
RErrorCode = RERR_NOMEMORY;
return NULL;
}
if (bla2 > INT_MAX - 4) {
RErrorCode = RERR_NOMEMORY;
return NULL;
}
@@ -78,6 +88,7 @@ RCreateImage(unsigned width, unsigned height, int alpha)
}
return image;
}