s390/mem_detect: fix detect_memory() error handling

[ Upstream commit e8514c63c3fd2ec1125cf48bdeed6de7b985d1b4 ]

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: d96ff778ee7d ("s390: unify identity mapping limits handling")
Reported-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/s390/boot/mem_detect.c b/arch/s390/boot/mem_detect.c
index 7fa1a32ea0f3f095612917617573e9bd3d8af4ed..0a5821ef4f1fd74390fbbebef5540d59c1f069a5 100644 (file)
--- 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);