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vmalloc() is a memory allocation function which can return NULL when some internal memory errors happen. So it is better to check the return of it to catch the error in time. Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com> Link: https://lore.kernel.org/r/tencent_4221FC4089F6DF01C48F192E5784038BA205@qq.com Signed-off-by: Takashi Iwai <tiwai@suse.de>