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Limit scaling in libwebp advanced_api_fuzzer.c

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Change-Id: Ic1e3fdc76f4bdcb1ac68cf4f9334d2e77ca29374
This commit is contained in:
Yannis Guyon 2023-01-27 14:39:14 +01:00
parent b54d21a01d
commit 7361842839
1 changed files with 8 additions and 3 deletions
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9
tests/fuzzer/advanced_api_fuzzer.c
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@ -69,9 +69,14 @@ int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) {
// files prepended with sizeof(config.options) zeroes to allow the fuzzer
// to modify these independently.
const int data_offset = 50;
if (size > data_offset + sizeof(config.options)) {
if (data_offset + sizeof(config.options) >= size) break;
memcpy(&config.options, data + data_offset, sizeof(config.options));
} else {
// Skip easily avoidable out-of-memory fuzzing errors.
if (config.options.use_scaling && config.options.scaled_width > 0 &&
config.options.scaled_height > 0 &&
(size_t)config.options.scaled_width * config.options.scaled_height >
kFuzzPxLimit) {
break;
}
}