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LibGfx/PortableFormat: Reject images with a maximum value of 0

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These images can't contain any meaningful information, so no need to try
to decode them. Doing so result in a `SIGFPE`, as we divide by this
value later on.

Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=57434&sort=-opened&can=1&q=proj%3Aserenity
This commit is contained in:
Lucas CHOLLET 2023-06-06 15:21:01 -04:00 • committed by Jelle Raaijmakers
parent 800a0092ca
commit b78622ddf7
1 changed files with 5 additions and 0 deletions
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5
Userland/Libraries/LibGfx/ImageFormats/PortableImageLoaderCommon.h
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@ -153,6 +153,11 @@ static ErrorOr<void> read_max_val(TContext& context)
{
context.format_details.max_val = TRY(read_number(*context.stream));
if (context.format_details.max_val == 0) {
context.state = TContext::State::Error;
return Error::from_string_literal("The image has a maximum value of 0");
}
if (context.format_details.max_val > 255) {
dbgln_if(PORTABLE_IMAGE_LOADER_DEBUG, "We can't parse 2 byte color for {}", TContext::FormatDetails::image_type);
context.state = TContext::State::Error;