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LibGfx/JPEG: Make non-zero-terminated APPn starts non-fatal

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Necessary but not sufficient for #18456.
This commit is contained in:
Nico Weber 2023-04-21 10:29:58 -04:00 • committed by Tim Flynn
parent 22e0603bf7
commit cf3835b29b
1 changed files with 6 additions and 2 deletions
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8
Userland/Libraries/LibGfx/ImageFormats/JPEGLoader.cpp
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@ -835,6 +835,7 @@ static ErrorOr<void> read_huffman_table(Stream& stream, JPEGLoadingContext& cont
static ErrorOr<void> read_icc_profile(Stream& stream, JPEGLoadingContext& context, int bytes_to_read)
{
// https://www.color.org/technotes/ICC-Technote-ProfileEmbedding.pdf, page 5, "JFIF".
if (bytes_to_read <= 2)
return Error::from_string_literal("icc marker too small");
@ -937,6 +938,7 @@ static ErrorOr<void> read_colour_encoding(Stream& stream, [[maybe_unused]] JPEGL
static ErrorOr<void> read_app_marker(Stream& stream, JPEGLoadingContext& context, int app_marker_number)
{
// B.2.4.6 - Application data syntax
i32 bytes_to_read = TRY(stream.read_value<BigEndian<u16>>());
if (bytes_to_read <= 2)
@ -945,8 +947,10 @@ static ErrorOr<void> read_app_marker(Stream& stream, JPEGLoadingContext& context
StringBuilder builder;
for (;;) {
if (bytes_to_read == 0)
return Error::from_string_literal("app marker size too small for identifier");
if (bytes_to_read == 0) {
dbgln_if(JPEG_DEBUG, "app marker {} does not start with zero-terminated string", app_marker_number);
return {};
}
auto c = TRY(stream.read_value<char>());
bytes_to_read--;