Messages in this thread Patch in this message | | | From | Jiapeng Chong <> | Subject | [PATCH v3] staging: r8188eu: Use strndup_user instead of kmalloc/copy_from_user | Date | Mon, 13 Dec 2021 17:25:58 +0800 |
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This code assumes that the user is going to give us a NUL terminated string which is not necessarily true.
Fix following coccicheck warning:
./drivers/staging/r8188eu/os_dep/ioctl_linux.c:4253:8-15: WARNING opportunity for memdup_user.
Reported-by: Abaci Robot <abaci@linux.alibaba.com> Fixes: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver") Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> --- Changes in v3: -Delete useless printk, modified the commit message and fixes tag.
drivers/staging/r8188eu/os_dep/ioctl_linux.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c index 77728ba78d76..d8c28f279aa0 100644 --- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c +++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c @@ -4247,18 +4247,10 @@ static int rtw_test( DBG_88E("+%s\n", __func__); len = wrqu->data.length; + pbuf = strndup_user(wrqu->data.pointer, len); + if (IS_ERR(pbuf)) + return PTR_ERR(pbuf); - pbuf = kzalloc(len, GFP_KERNEL); - if (!pbuf) { - DBG_88E("%s: no memory!\n", __func__); - return -ENOMEM; - } - - if (copy_from_user(pbuf, wrqu->data.pointer, len)) { - kfree(pbuf); - DBG_88E("%s: copy from user fail!\n", __func__); - return -EFAULT; - } DBG_88E("%s: string =\"%s\"\n", __func__, pbuf); ptmp = (char *)pbuf; -- 2.20.1.7.g153144c
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