From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 95A043E716F; Mon, 17 Aug 2026 14:25:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786976737; cv=none; b=MZ5KHK69PazJLXSNO0/3wyVKGhEXzBhj1e7TNU7+wzoxkM5kS2mdA4wXHEmOzrb3BlTijbULPxxg/jGqNO2i2IaSl+8KZVuotqls035oehOHHcBY/nVTaKuBfhrB88V820mwRAJyDGc7/kdtglGcFr+t7Jgk0n+sD1WxCqvfhF0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786976737; c=relaxed/simple; bh=7FWj2SSmRooNZS/IZXylAQiLMi5/RgY+g6fyQNJeo5A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fK2wjnxAY2pepipgxhKLOOvn3OmCLICkpnma6jiltFBOWcHQlt7xmBLbOP+rgZcI97pPXEYAHeKTx5BuZvEgShjYGRix15j1rai4FGYLbMSlJK33W+LvqPwiBgNBh56IURjdpAifuvQjU8dv8VHfqHbaw46xjhRRpCDs6UpG7OE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=KbP0/U49; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="KbP0/U49" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D7F701F000E9; Mon, 17 Aug 2026 14:25:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786976736; bh=Eaggv/4mR+6utHvF1n/XsgM8U6nYCgL3h2xhFHATuUE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=KbP0/U49DNYctMmoUTEMtGfVuZrjDmM2A97Gr7ujNQ5ktMi0PoFT7ptRCcaS4SOJ7 My20cQgvNqHmRkIIJlvc2Q9i0T/bWDKRT8IHUv7JPbGyauYugbEbgLQE96z+IP0Ghj mCYP2rqa7iEC1G/aTj/f2kLqieyIh2t5crKnLHFk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tristan Madani , Christian Lamparter , Jeff Johnson , Sasha Levin Subject: [PATCH 5.15 086/456] wifi: carl9170: bound memcpy length in cmd callback to prevent OOB read Date: Mon, 17 Aug 2026 15:27:56 +0200 Message-ID: <20260817132543.480834804@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132539.792407575@linuxfoundation.org> References: <20260817132539.792407575@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tristan Madani [ Upstream commit 4cde55b2feff9504d1f993ab80e84e7ccb62791c ] When the firmware sends a command response with a length mismatch, carl9170_cmd_callback() logs the mismatch and calls carl9170_restart() but then falls through to memcpy(ar->readbuf, buffer + 4, len - 4). Since len comes from the firmware and can exceed ar->readlen, this copies more data than the readbuf was allocated for. Bound the memcpy to min(len - 4, ar->readlen) so that the response is still completed -- avoiding repeated restarts from queued garbage -- while preventing an overread past the response buffer. Fixes: a84fab3cbfdc ("carl9170: 802.11 rx/tx processing and usb backend") Signed-off-by: Tristan Madani Acked-by: Christian Lamparter Closes: https://syzkaller.appspot.com/bug?extid=5c1ca6ccaa1215781cac Link: https://patch.msgid.link/20260421134929.325662-2-tristmd@gmail.com Signed-off-by: Jeff Johnson Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/carl9170/rx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/carl9170/rx.c b/drivers/net/wireless/ath/carl9170/rx.c index 908c4c8b7f8256..9a25c2a540b95f 100644 --- a/drivers/net/wireless/ath/carl9170/rx.c +++ b/drivers/net/wireless/ath/carl9170/rx.c @@ -150,7 +150,8 @@ static void carl9170_cmd_callback(struct ar9170 *ar, u32 len, void *buffer) spin_lock(&ar->cmd_lock); if (ar->readbuf) { if (len >= 4) - memcpy(ar->readbuf, buffer + 4, len - 4); + memcpy(ar->readbuf, buffer + 4, + min_t(u32, len - 4, ar->readlen)); ar->readbuf = NULL; } -- 2.53.0