linux-kernel - lz4 hc buffer overflow

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Message-ID: <js2vmwcgwyx5kxq3csunc3piwkpfsebg3u2zewok6iis5wgn2e@eyy4fzryskj7>
Date: Sun, 10 Mar 2024 20:00:24 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>, 
	Guo Xuenan <guoxuenan@...wei.com>, Rajat Asthana <thisisrast7@...il.com>, 
	Gao Xiang <xiang@...nel.org>, Nick Terrell <terrelln@...com>
Cc: linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: lz4 hc buffer overflow

reference https://github.com/koverstreet/bcachefs/issues/658

It looks like something is off with the bounds checking in LZ4 HC; I
haven't dug too deep yet. Never saw this with regular LZ4.

Anyone know anything? Are we missing a fix from the userspace library?