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@xxxxxxxxxxxxxxxxx>
Fixes: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver")
Signed-off-by: Jiapeng Chong <jiapeng.chong@xxxxxxxxxxxxxxxxx>
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