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 7A9B43CE495; Sat, 12 Sep 2026 15:53:27 +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=1789228408; cv=none; b=QSU3clqKzFJSAsbt/aNB3dcbh28Ge63HXY1Tq6EOgXFtw52S0ZTlKwYgB1VywrcnvmsdxNzINMRogLAu0x1b47Wu5RFDgN1vMfpo6YnS0UIlhs5ycCL1RBo2c29gigHqDn4Xnkn9viFVeeq9eCcMdf61vKzI5Ag/torbeymzccI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789228408; c=relaxed/simple; bh=KcDza/CGjzdXl69t37fkxCvlpiqOKkOSl0Sna4864FM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Iwux0z0uwDqaPVpO6zahah9LEQXcFZRCkvoNaS97YdHzYeM5TRzAveDooOUcJJfaz7TqERarZGs6XtXNWqdU6WQngUQuKQZCyFdwYj0rmIlAHG7Y80FxBtep0JCApmL1J/8qPra9fA59FOlXf6IyAot2s9e2mPXRDpzUmXHaLPw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=L2YVTCrH; 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="L2YVTCrH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F3371F000FF; Sat, 12 Sep 2026 15:53:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789228407; bh=mLwv5lqqkWabXNOGFpS7udxH9KcjZ97gblNNwPgLTPc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=L2YVTCrHl81SC+cRaV2c09A7rmxtvIMDndhT6O/FB/s2nYtNu1UnC1h5RqaOdqKWm IsaTonhle9mr5+SrjzxCIe8cw/E0kwQR+ySSszQxOZc5pWtByC4ptKH2nDDd0Ih1iE ry2Rr5wEkYETmOs3z/C6/8bZbekE1UTVCuQ49yt0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Biren Pandya , Sakari Ailus Subject: [PATCH 6.1 0372/1191] media: i2c: ov7740: fix use-after-destroy in remove Date: Sat, 12 Sep 2026 08:51:40 +0200 Message-ID: <20260912065556.586254809@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065548.086904252@linuxfoundation.org> References: <20260912065548.086904252@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-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 @@ -1158,10 +1158,8 @@ 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);