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s390/mem_detect: fix detect_memory() error handling

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[ Upstream commit 3400c35a4090704e6c465449616ab7e67a9209e7 ]

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: 73045a08cf ("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>
This commit is contained in:
Vasily Gorbik 2023-01-27 14:03:07 +01:00 committed by Greg Kroah-Hartman
parent a0d91a48e1
commit 9e1e58525d
1 changed files with 1 additions and 1 deletions
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arch/s390/boot/mem_detect.c
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@ -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);