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diff -up libwebp-0.3.0/src/enc/alpha.c.mozilla-1819244 libwebp-0.3.0/src/enc/alpha.c
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--- libwebp-0.3.0/src/enc/alpha.c.mozilla-1819244 2013-03-29 23:55:16.000000000 +0100
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+++ libwebp-0.3.0/src/enc/alpha.c 2023-04-26 12:06:31.017969727 +0200
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@@ -123,8 +123,8 @@ static int EncodeAlphaInternal(const uin
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header = method | (filter << 2);
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if (reduce_levels) header |= ALPHA_PREPROCESSED_LEVELS << 4;
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- VP8BitWriterInit(bw, expected_size);
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- VP8BitWriterAppend(bw, &header, ALPHA_HEADER_LEN);
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+ ok = VP8BitWriterInit(bw, expected_size);
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+ ok = ok && VP8BitWriterAppend(bw, &header, ALPHA_HEADER_LEN);
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filter_func = WebPFilters[filter];
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if (filter_func != NULL) {
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@@ -135,7 +135,7 @@ static int EncodeAlphaInternal(const uin
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}
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if (method == ALPHA_NO_COMPRESSION) {
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- ok = VP8BitWriterAppend(bw, alpha_src, width * height);
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+ ok = ok && VP8BitWriterAppend(bw, alpha_src, width * height);
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ok = ok && !bw->error_;
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} else {
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ok = EncodeLossless(alpha_src, width, height, effort_level, bw, stats);
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