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GetHistoBits: fix integer overflow

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huff_image_size was a size_t (=32 bits with 32-bit builds) which could
rollover causing an incorrectly sized allocation and a crash in lossless
encoding.
fixes issue #128

Change-Id: I175c8c6132ba9792034807c5c1028dfddfeb4ea5
This commit is contained in:
James Zern 2012-10-03 12:14:44 -07:00
parent a792b913bd
commit 80237c4371
1 changed files with 4 additions and 4 deletions
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8
src/enc/vp8l.c
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@ -899,13 +899,13 @@ static int GetHistoBits(const WebPConfig* const config,
const WebPPicture* const pic) {
const int width = pic->width;
const int height = pic->height;
const size_t hist_size = sizeof(VP8LHistogram);
const uint64_t hist_size = sizeof(VP8LHistogram);
// Make tile size a function of encoding method (Range: 0 to 6).
int histo_bits = 7 - config->method;
while (1) {
const size_t huff_image_size = VP8LSubSampleSize(width, histo_bits) *
VP8LSubSampleSize(height, histo_bits) *
hist_size;
const uint64_t huff_image_size = VP8LSubSampleSize(width, histo_bits) *
VP8LSubSampleSize(height, histo_bits) *
hist_size;
if (huff_image_size <= MAX_HUFF_IMAGE_SIZE) break;
++histo_bits;
}