[ Upstream commitb4af096b5d] Add check for strsep() in order to transfer the error. Fixes:cd3bc044af("KEYS: encrypted: Instantiate key with user-provided decrypted data") Signed-off-by: Chen Ni <nichen@iscas.ac.cn> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>