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 A213C33E36A; Sat, 30 May 2026 17:38:14 +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=1780162695; cv=none; b=I0Te5Eox41Zo77CHFy5Rm0JV2cWSFPZ7sh3EW3skUz9vq6RCHOZcHWDxBRlllznBLBRr4LnmPwkxI996Z+Hk6CfDOmJzXvRDui7ppkeYX3N3fnXnq7E5L7vElum2iOsonb0N1Osc+HlqhqovidUqeB1P4a+VBdsNaV2bDoP8Ig0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780162695; c=relaxed/simple; bh=QHZDWQrOFo0qEQFDfStoQZBG9Ict5NsrCHKty4Xg2jM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=GmbxpC8n3BIzF8AUL/dXt9b5hSei+USnLM8R3zw4HA4zSlBnR7zZo1EG4EoDBahHhuQu8Ctju8PR2Km9r/CrQ0THct8Laex9aNAiN0wz8YjPYExyClZcW778oTGcPMs+/xIKSCNnYDu+jHz9omGB/pbpGUEOgWg6y0uEdHtcND8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=kLotwaV4; 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="kLotwaV4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4FF31F00893; Sat, 30 May 2026 17:38:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780162694; bh=9hBMIk8+5CuMTr4jcsNN+oRP9TsWnbNWsBsCem/+XDA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=kLotwaV47J/uo8J238K/Um1QdiWgKsbLk3WtfkxDfbgjbx7epFQ3hAS7biecpg++r N9ARbE1+euENeSseroWYC2XGzkZpSQ/myvE6uUjHoFv1sBfoZ0jq1UDDgG8sl9j6UH Sm3trrLTcRON9sGFFzrt8dJ1mLCkaVNED3RjCDzg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Beno=C3=AEt=20Sevens?= , Silvan Jegen , Jiri Kosina , Sasha Levin Subject: [PATCH 5.15 013/776] HID: roccat: fix use-after-free in roccat_report_event Date: Sat, 30 May 2026 17:55:27 +0200 Message-ID: <20260530160240.601783756@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Benoît Sevens [ Upstream commit d802d848308b35220f21a8025352f0c0aba15c12 ] roccat_report_event() iterates over the device->readers list without holding the readers_lock. This allows a concurrent roccat_release() to remove and free a reader while it's still being accessed, leading to a use-after-free. Protect the readers list traversal with the readers_lock mutex. Signed-off-by: Benoît Sevens Reviewed-by: Silvan Jegen Signed-off-by: Jiri Kosina Signed-off-by: Sasha Levin --- drivers/hid/hid-roccat.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/hid/hid-roccat.c b/drivers/hid/hid-roccat.c index 6da80e442fdd1..420e4335c3e83 100644 --- a/drivers/hid/hid-roccat.c +++ b/drivers/hid/hid-roccat.c @@ -257,6 +257,7 @@ int roccat_report_event(int minor, u8 const *data) if (!new_value) return -ENOMEM; + mutex_lock(&device->readers_lock); mutex_lock(&device->cbuf_lock); report = &device->cbuf[device->cbuf_end]; @@ -279,6 +280,7 @@ int roccat_report_event(int minor, u8 const *data) } mutex_unlock(&device->cbuf_lock); + mutex_unlock(&device->readers_lock); wake_up_interruptible(&device->wait); return 0; -- 2.53.0