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[libpng16] Check that the eXIf chunk has at least 2 bytes and begins

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with "II" or "MM".
This commit is contained in:
Glenn Randers-Pehrson
2017-08-06 10:24:04 -05:00
parent c82ae40e9f
commit cf713fb0ab
3 changed files with 16 additions and 0 deletions
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14
pngrutil.c
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@@ -2035,6 +2035,13 @@ png_handle_eXIf(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
if (length < 2)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "too short");
return;
}
else if (info_ptr == NULL || (info_ptr->valid & PNG_INFO_eXIf) != 0)
{
png_crc_finish(png_ptr, length);
@@ -2059,6 +2066,13 @@ png_handle_eXIf(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
png_byte buf[1];
png_crc_read(png_ptr, buf, 1);
info_ptr->eXIf_buf[i] = buf[0];
if (i == 2 && buf[0] != 'M' && buf[0] != 'I'
&& info_ptr->eXIf_buf[0] != buf[0])
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "incorrect byte-order specifier");
return;
}
}
if (png_crc_finish(png_ptr, 0) != 0)