From nobody Thu Dec 18 07:19:52 2025 Received: from cstnet.cn (smtp81.cstnet.cn [159.226.251.81]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C8331EEA46; Thu, 13 Mar 2025 08:38:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741855101; cv=none; b=Rle7dY+6DDSQBM9tY5ywKQLsHzETjsasm31AMUeiFguQ3ny5OR2D4fg3H47MpZwcKcrUFc66pg/E+Kwb9SD5vO4vcaDpOLrZckpjdmDVP4Er8eJZ3ogkmXtB1H6cXUFHNch3Sy+NUPbZQ0gL6blOlQ4+uEwENrp98TqyqrgoxF4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741855101; c=relaxed/simple; bh=shItUb0ID8hVaNEfs39fAcAoUpxrrDzvTA9HlZjWGNU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=SGQcyCCxkQC8M8R5ZpJKhUg36bt21BpCCAnSY7FowNs3nhk59w/8wl9lBXKP4PFPr9RNdXQ59dmATb+LSn98AUcRoIttluBL3K9wfKfgKUwDNIClk+YtEBs5PA177wq54VH+zhi5Nsy01mnnZw/0P3yWVuvDn4dxfHvYEziZOAA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from icess-ProLiant-DL380-Gen10.. (unknown [183.174.60.14]) by APP-03 (Coremail) with SMTP id rQCowAB3fNhxmdJnPaXWFA--.22502S2; Thu, 13 Mar 2025 16:38:11 +0800 (CST) From: Ma Ke To: dmitry.torokhov@gmail.com, bentiss@kernel.org, jeff@labundy.com Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Ma Ke , stable@vger.kernel.org Subject: [PATCH] Input: fix error handling in input_register_device() Date: Thu, 13 Mar 2025 16:38:03 +0800 Message-Id: <20250313083803.307646-1-make24@iscas.ac.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: rQCowAB3fNhxmdJnPaXWFA--.22502S2 X-Coremail-Antispam: 1UD129KBjvdXoW7GF13GrWUGF4kuFW8CF1xZrb_yoWDJrX_W3 4Sv3s7Xr18tw1kKFnxAFnxZrn7KFsFqrWrur43trn5Wa4rXFZru34kWr40vr1jqa17AF1D J3WUGr48Aw4rWjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUb3xFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr0_ Gr1UM28EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Cr 1j6rxdM2vYz4IE04k24VAvwVAKI4IrM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVAC Y4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r106r15McIj6I8E87Iv67AKxVWUJV W8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI2 0VAGYxC7MxkF7I0En4kS14v26r126r1DMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4 AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE 17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMI IF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4l IxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvf C2KfnxnUUI43ZEXa7VUbE1v3UUUUU== X-CM-SenderInfo: ppdnvj2u6l2u1dvotugofq/ Content-Type: text/plain; charset="utf-8" Once device_add() failed, we should call put_device() to decrement reference count for cleanup. Or it could cause memory leak. As comment of device_add() says, 'if device_add() succeeds, you should call device_del() when you want to get rid of it. If device_add() has not succeeded, use only put_device() to drop the reference count'. Found by code review. Cc: stable@vger.kernel.org Fixes: 0cd587735205 ("Input: preallocate memory to hold event values") Signed-off-by: Ma Ke --- drivers/input/input.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/input/input.c b/drivers/input/input.c index c9e3ac64bcd0..2e70f346dadc 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -2424,6 +2424,7 @@ int input_register_device(struct input_dev *dev) err_device_del: device_del(&dev->dev); err_devres_free: + put_device(&dev->dev); devres_free(devres); return error; } --=20 2.25.1