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 DE96342882B; Sat, 12 Sep 2026 11:49:57 +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=1789213799; cv=none; b=LrHSaTVR/w6ppHnsw8IX/tlys2J3mktucfXIHzbQ3PRoLF3/Jn9Pk7bzOhEwK5u8PLws8DpkX847FTnaiF85thDl6N4unyiU4m74t32nKHpCqBMB/MDko1rm3AgU3O4SfML0DshDb8FI63su7Gl4LXNuYseA+UpGljPVG3BX5HI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789213799; c=relaxed/simple; bh=/c+4oa4IBs8VCCj7LEmWwNGFLo0rK8x3wOPTZH5e5Rk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AMfbcb79nGlO3nvRU4gX0gy2KUnv2czgXnJoSVnWLqB8M7/+3HAm0CzUnbGdIdblUuFwsOnFktn7fKVPR59evO6tnUl0lvipX3dsgDSwLj7DXzXnivjVIgYnNiz45IPSCDcV9384Z7TWMu2zusqIe3hgDpipmX0/VLHJZnbmIkc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dDhNyfZf; 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="dDhNyfZf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5F241F000FF; Sat, 12 Sep 2026 11:49:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789213797; bh=2NIp24rzUdTanxXhw9kEU5uLbGTY41Iada1q2Ztp2i8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dDhNyfZfOsVIg+LaNOuCGuJR4UCweJBJ6Hzqbb1eU+qSNpyyq+MnSTvlMS4k7bljL ifdAmuiRJu9y0SCozbbcJz57R+pFbRmOWPkMaDxjcjI+QGI95t1jyalRAXNZIB2MB+ oWohVZBTk5f40hsqedqcboAWHBif79wAkRaQSibY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Biren Pandya , Sakari Ailus Subject: [PATCH 6.12 0196/1376] media: i2c: ov7740: fix use-after-destroy in remove Date: Sat, 12 Sep 2026 08:43:42 +0200 Message-ID: <20260912065611.918192131@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.535295758@linuxfoundation.org> References: <20260912065607.535295758@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Biren Pandya commit 5d1b3dea5a44124bab6c14a2d71b977dabed54e7 upstream. The ov7740_remove() function had a severe teardown order bug where it destroyed the driver's mutex before freeing the V4L2 control handler which relies on that mutex, leading to a use-after-destroy kernel panic. Furthermore, the driver explicitly called v4l2_ctrl_handler_free() and mutex_destroy() sequentially, but then called ov7740_free_controls() which invokes both of them a second time, resulting in a double-free. This patch fixes the issue by unregistering the subdevice first, and relying exclusively on ov7740_free_controls() to safely tear down the mutex and control handler in the correct order. Fixes: 39c5c4471b8d ("media: i2c: Add the ov7740 image sensor driver") Cc: stable@vger.kernel.org Signed-off-by: Biren Pandya Signed-off-by: Sakari Ailus Signed-off-by: Greg Kroah-Hartman --- drivers/media/i2c/ov7740.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/drivers/media/i2c/ov7740.c +++ b/drivers/media/i2c/ov7740.c @@ -1119,10 +1119,8 @@ static void ov7740_remove(struct i2c_cli struct v4l2_subdev *sd = i2c_get_clientdata(client); struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev); - mutex_destroy(&ov7740->mutex); - v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler); - media_entity_cleanup(&ov7740->subdev.entity); v4l2_async_unregister_subdev(sd); + media_entity_cleanup(&ov7740->subdev.entity); ov7740_free_controls(ov7740); pm_runtime_get_sync(&client->dev);