From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794061595; b=bKlGIEPv4qvcaYWc6ALDinjOPRciPyIT7lllTshu8/XfjRKmtt9ockuHeIQqUdP+XqYu OKiOPb6PutOKo1RyZ8Rq2s4MYoMYaQG5vq81i5Ds6rMN8IY7/sIyu1szGR3y21ydODFuG ckZJWii605eJWy0zqhpEfM48/ZVqG0yFHjM1S2dtNWOqazDuCa2C8TAvOz1h+z0tTa0xe 5JsdDmsajdNdrhf9DELNTZqFbaoZerY4rJEAmlkHR9BKbsqc7ZuwBhvNrSzFgSw68EimC MTz1/WBEkpTrBTwN1y1CLBXX9fMClMHbvoSr+gyxgGgU9GM17+jTGNj72q+otvKtHRg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794061595; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=hg3vaou/jBBcyFE661MkIz3mWVU9L+oD+MVtL4pMcSc=; b=QKMy/aQBWQJiKxDFLIbWDS6s1oq/nmbhJKqq0pJ8mw+uNyhCtikk1Arnx/gL7o2YiaJ3 ut+1KQayWPoY9t+W60KHpe6yw5Aw7ca0CJb7g04dBPsS5XINVnADhwxSbqkh+29mobf/s kmhNwS/4vtYdfemo8x5wTJwDlFZSPLyk7axX0+u2QbUFKwjwHwJ+7OwhHg8SgaHemUuAj FIREig9AT7JBLJFf6B7Nk3ZyqEA8FCLo8AeapNwQpLdmkuekqyiLJ7wEa+u/B+b5KU6dr Z8PsOgsNyi8nzNEw1wBMcf+CM4EZqfhRSP3SGiX6ZUbCkXBiZBFVlsF1PgkLwHOjpXg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=ucc+hOCo; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2C8F4606A32E; Sat, 7 Nov 2026 14:26:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=ucc+hOCo Received: by smtp.kernel.org (Postfix) with ESMTPSA id CE6941F0089F; Sat, 7 Nov 2026 14:26:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794061595; bh=hg3vaou/jBBcyFE661MkIz3mWVU9L+oD+MVtL4pMcSc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ucc+hOCoBpMMTRPpvSKkwgVJt0l1DBxoEcBcOkin7qd+FZqw/SrBy9uSPwp7B/q0C 1QiVFVzcvjUlTKLdiTelsldfC6GYhIEbBepC3yYS5YXd+TPBfZucOKN9euylbqV9H2 zTWGHHF9AqwxtByrookDCh6Z6gFDRemYwsJhEuOU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sean Young , Hans Verkuil Subject: [PATCH 6.12 0661/1536] media: rc: Ensure that rc_unregister_device() does not free input device Date: Sat, 7 Nov 2026 08:44:37 -0500 Message-ID: <20261107135016.081531400@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134957.653319350@linuxfoundation.org> References: <20261107134957.653319350@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sean Young commit 61c7ca95d2483c77dfdde1b007cbe846f145dec4 upstream. During or after rc_unregister_device(), IR may still be reported which results in a input event being reported. This could result in a null pointer deref in rc_keydown() or a use-after-free of the input device if the pointer was read before it is set to NULL. Fixes: dccc0c3ddf8f ("media: rc: fix race between unregister and urb/irq callbacks") Signed-off-by: Sean Young Cc: stable@vger.kernel.org Acked-by: Hans Verkuil Signed-off-by: Greg Kroah-Hartman --- drivers/media/rc/rc-main.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/media/rc/rc-main.c +++ b/drivers/media/rc/rc-main.c @@ -1742,7 +1742,7 @@ void rc_free_device(struct rc_dev *dev) if (!dev) return; - input_free_device(dev->input_dev); + input_put_device(dev->input_dev); put_device(&dev->dev); @@ -1854,6 +1854,8 @@ static int rc_setup_rx_device(struct rc_ if (rc) return rc; + input_get_device(dev->input_dev); + /* * Default delay of 250ms is too short for some protocols, especially * since the timeout is currently set to 250ms. Increase it to 500ms, @@ -1880,10 +1882,8 @@ static void rc_free_rx_device(struct rc_ if (!dev) return; - if (dev->input_dev) { + if (dev->input_dev) input_unregister_device(dev->input_dev); - dev->input_dev = NULL; - } ir_free_table(&dev->rc_map); }