From 30b7a2c19e296fc4b8a9a21d67752d8dd55bc7dc Mon Sep 17 00:00:00 2001 From: Vasyl Gomonovych Date: Wed, 22 Nov 2017 16:25:30 +0100 Subject: [PATCH] misc: mic: Use memdup_user() as a cleanup Fix coccicheck warning which recommends to use memdup_user(): drivers/misc/mic/vop/vop_vringh.c:940:14-21: WARNING opportunity for memdup_user drivers/misc/mic/vop/vop_vringh.c:998:8-15: WARNING opportunity for memdup_user Generated by: scripts/coccinelle/memdup_user/memdup_user.cocci Signed-off-by: Vasyl Gomonovych Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mic/vop/vop_vringh.c | 21 +++++++-------------- 1 file changed, 7 insertions(+), 14 deletions(-) diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c index fed992e2c258..bde0305ebd91 100644 --- a/drivers/misc/mic/vop/vop_vringh.c +++ b/drivers/misc/mic/vop/vop_vringh.c @@ -937,13 +937,10 @@ static long vop_ioctl(struct file *f, unsigned int cmd, unsigned long arg) dd.num_vq > MIC_MAX_VRINGS) return -EINVAL; - dd_config = kzalloc(mic_desc_size(&dd), GFP_KERNEL); - if (!dd_config) - return -ENOMEM; - if (copy_from_user(dd_config, argp, mic_desc_size(&dd))) { - ret = -EFAULT; - goto free_ret; - } + dd_config = memdup_user(argp, mic_desc_size(&dd)); + if (IS_ERR(dd_config)) + return PTR_ERR(dd_config); + /* Ensure desc has not changed between the two reads */ if (memcmp(&dd, dd_config, sizeof(dd))) { ret = -EINVAL; @@ -995,15 +992,11 @@ _unlock_ret: ret = vop_vdev_inited(vdev); if (ret) goto __unlock_ret; - buf = kzalloc(vdev->dd->config_len, GFP_KERNEL); - if (!buf) { - ret = -ENOMEM; + buf = memdup_user(argp, vdev->dd->config_len); + if (IS_ERR(buf)) { + ret = PTR_ERR(buf); goto __unlock_ret; } - if (copy_from_user(buf, argp, vdev->dd->config_len)) { - ret = -EFAULT; - goto done; - } ret = vop_virtio_config_change(vdev, buf); done: kfree(buf); -- 2.30.2