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avcodec/pnm_parser: Avoid reparsing failed data.
Alternatively the parser could be re implemented / redesigned so as to better and more efficiently find frame boundaries Fixes: Timeout Fixes: 9210/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PBM_fuzzer-4770771833454592 Fixes: 9214/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PPM_fuzzer-5741633353023488 Fixes: 9219/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGM_fuzzer-6249230237696000 Fixes: 9550/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PAM_fuzzer-5312669836902400 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -51,8 +51,9 @@ retry:
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if (pc->index) {
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pc->index = 0;
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} else {
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buf++;
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buf_size--;
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unsigned step = FFMAX(1, pnmctx.bytestream - pnmctx.bytestream_start);
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buf += step;
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buf_size -= step;
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}
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goto retry;
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}
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