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advanced_api_fuzzer.cc: use crop dims in OOM check

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Apply crop dimensions before calculating scaled width/height to ensure
the check against fuzz_utils::kFuzzPxLimit will use the same dimensions
as the decoder.

Bug: oss-fuzz:69873
Change-Id: Icd0862eadf8575135b6d53376acc79d14733a0e5
This commit is contained in:
James Zern 2024-06-24 16:35:06 -07:00
parent f2fe8decce
commit 96d79f8481
1 changed files with 17 additions and 3 deletions
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20
tests/fuzzer/advanced_api_fuzzer.cc
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@ -20,6 +20,7 @@
#include <string_view>
#include "./fuzz_utils.h"
#include "src/dec/webpi_dec.h"
#include "src/utils/rescaler_utils.h"
#include "src/webp/decode.h"
@ -80,11 +81,24 @@ void AdvancedApiTest(std::string_view blob, uint8_t factor_u8, bool flip,
// Skip easily avoidable out-of-memory fuzzing errors.
if (config.options.use_scaling) {
int input_width = config.input.width;
int input_height = config.input.height;
if (config.options.use_cropping) {
const int cw = config.options.crop_width;
const int ch = config.options.crop_height;
const int x = config.options.crop_left & ~1;
const int y = config.options.crop_top & ~1;
if (WebPCheckCropDimensions(input_width, input_height, x, y, cw,
ch)) {
input_width = cw;
input_height = ch;
}
}
int scaled_width = config.options.scaled_width;
int scaled_height = config.options.scaled_height;
if (WebPRescalerGetScaledDimensions(config.input.width,
config.input.height, &scaled_width,
&scaled_height)) {
if (WebPRescalerGetScaledDimensions(input_width, input_height,
&scaled_width, &scaled_height)) {
size_t fuzz_px_limit = fuzz_utils::kFuzzPxLimit;
if (scaled_width != config.input.width ||
scaled_height != config.input.height) {