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Merge pull request #26734 from asmorkalov:as/png_corrupted

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Fixed fread size check for corrupted PNGs
This commit is contained in:
Alexander Smorkalov
2025-01-08 15:47:19 +03:00
committed by GitHub
parent 66ffeae4b1 198f23890e
commit d2704548b4
1 changed files with 3 additions and 9 deletions
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modules/imgcodecs/src/grfmt_png.cpp
+3 -9
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@@ -253,18 +253,12 @@ bool PngDecoder::readHeader()
return false;
}
png_init_io(png_ptr, m_f);
if (fread(sig, 1, 8, m_f))
id = read_chunk(m_chunkIHDR);
}
if (id != id_IHDR)
{
if (read_from_io(&sig, 8, 1) != 1)
return false;
id = read_chunk(m_chunkIHDR);
}
if (read_from_io(&sig, 8, 1) != 1)
return false;
id = read_chunk(m_chunkIHDR);
if (!(id == id_IHDR && m_chunkIHDR.p.size() == 25))
{
return false;