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unzip: Don't fail from mmap when trying to decompress empty files

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Given an empty file, unzip would try to create a zero-size memory
mapping of that file, which would fail with EINVAL. With this commit,
attempting to unzip an empty file of course still fails, since that's
not a valid PKZIP file, but it now fails for the correct reason and with
the correct error message.
This commit is contained in:
Rummskartoffel 2022-01-15 20:14:14 +01:00 committed by Idan Horowitz
parent 1a2f71581b
commit 4aaab80649
Notes: sideshowbarker 2024-07-17 20:49:57 +09:00 
Author: https://github.com/Rummskartoffel
Commit: https://github.com/SerenityOS/serenity/commit/4aaab80649d
Pull-request: https://github.com/SerenityOS/serenity/pull/11924
Reviewed-by: https://github.com/IdanHo ✅
1 changed files with 7 additions and 2 deletions
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9
Userland/Utilities/unzip.cpp
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@ -100,12 +100,17 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
return 1;
}
auto mapped_file = TRY(Core::MappedFile::map(zip_file_path));
RefPtr<Core::MappedFile> mapped_file;
ReadonlyBytes input_bytes;
if (st.st_size > 0) {
mapped_file = TRY(Core::MappedFile::map(zip_file_path));
input_bytes = mapped_file->bytes();
}
if (!quiet)
warnln("Archive: {}", zip_file_path);
auto zip_file = Archive::Zip::try_create(mapped_file->bytes());
auto zip_file = Archive::Zip::try_create(input_bytes);
if (!zip_file.has_value()) {
warnln("Invalid zip file {}", zip_file_path);
return 1;