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[ Upstream commit72d061ee63] The chan_alloc_skb_cb() function is supposed to return error pointers on error. Returning NULL will lead to a NULL dereference. Fixes:6b8d4a6a03("Bluetooth: 6LoWPAN: Use connected oriented channel instead of fixed one") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>