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[ Upstream commitb3d40c3ec3] As the kcalloc may return NULL pointer, it should be better to check the ishtp_dma_tx_map before use in order to avoid NULL pointer dereference. Fixes:3703f53b99("HID: intel_ish-hid: ISH Transport layer") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Sasha Levin <sashal@kernel.org>