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Add check for the return value of kstrdup() and return the error, if it
fails in order to avoid NULL pointer dereference.
Signed-off-by: Yi Yang <yiyang13@huawei.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230904035220.48164-1-yiyang13@huawei.com

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>