From 3400c35a4090704e6c465449616ab7e67a9209e7 Mon Sep 17 00:00:00 2001 From: Vasily Gorbik Date: Fri, 27 Jan 2023 14:03:07 +0100 Subject: [PATCH] s390/mem_detect: fix detect_memory() error handling Currently if for some reason sclp_early_read_info() fails, sclp_early_get_memsize() will not set max_physmem_end and it will stay uninitialized. Any garbage value other than 0 will lead to detect_memory() taking wrong path or returning a garbage value as max_physmem_end. To avoid that simply initialize max_physmem_end. Fixes: 73045a08cf55 ("s390: unify identity mapping limits handling") Reported-by: Alexander Gordeev Reviewed-by: Alexander Gordeev Signed-off-by: Vasily Gorbik Signed-off-by: Heiko Carstens --- arch/s390/boot/mem_detect.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/boot/mem_detect.c b/arch/s390/boot/mem_detect.c index 7fa1a32ea0f3..0a5821ef4f1f 100644 --- a/arch/s390/boot/mem_detect.c +++ b/arch/s390/boot/mem_detect.c @@ -165,7 +165,7 @@ static void search_mem_end(void) unsigned long detect_memory(void) { - unsigned long max_physmem_end; + unsigned long max_physmem_end = 0; sclp_early_get_memsize(&max_physmem_end);