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[ Upstream commit4a81f78caa] In the do_validate_mem(), the call to add_interval() does not handle errors. If kmalloc() fails in add_interval(), it could result in a null pointer being inserted into the linked list, leading to illegal memory access when sub_interval() is called next. This patch adds an error handling for the add_interval(). If add_interval() returns an error, the function will return early with the error code. Fixes:7b4884ca88("pcmcia: validate late-added resources") Signed-off-by: Wentao Liang <vulab@iscas.ac.cn> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Sasha Levin <sashal@kernel.org>