btrfs: zlib: zero-initialize zlib workspace

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KMSAN reports uses of uninitialized memory in zlib's longest_match()
called on memory originating from zlib_alloc_workspace().
This issue is known by zlib maintainers and is claimed to be harmless,
but to be on the safe side we'd better initialize the memory.

Link: https://zlib.net/zlib_faq.html#faq36
Reported-by: syzbot+14d9e7602ebdf7ec0a60@syzkaller.appspotmail.com
CC: stable@vger.kernel.org # 5.4+
Signed-off-by: Alexander Potapenko <glider@google.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Alexander Potapenko 2023-01-24 12:32:34 +01:00 • committed by David Sterba

parent 3c538de0f2

commit eadd7deca0

1 changed files with 1 additions and 1 deletions

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fs/btrfs/zlib.c

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