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| author | Vasily Gorbik <gor@linux.ibm.com> | 2026-08-19 12:30:05 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2026-09-01 12:44:47 +0200 |
| commit | a0c798ed4103316c23938bdf625af364fbd38016 (patch) | |
| tree | bf9c3bdaad97625fc88e052b772f6f06fbbe4b05 | |
| parent | bb06e5a2a031c89b1f1f60ff45ce80f8e4f6ee56 (diff) | |
| download | linux-a0c798ed4103316c23938bdf625af364fbd38016.tar.gz linux-a0c798ed4103316c23938bdf625af364fbd38016.zip | |
s390/boot: Fix physical memory search range
search_mem_end() calculates the number of 1MB blocks with a signed int
literal. CONFIG_MAX_PHYSMEM_BITS values of 51 and above either overflow
the signed int or shift beyond its width. This produces an invalid search
range when the binary-search memory detection fallback is used.
Use an unsigned long literal so the full supported physical address range
is represented.
Fixes: 54c57795e848 ("s390/mem_detect: replace tprot loop with binary search")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| -rw-r--r-- | arch/s390/boot/physmem_info.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/boot/physmem_info.c b/arch/s390/boot/physmem_info.c index 1f2ca5435838..0ebb2174713f 100644 --- a/arch/s390/boot/physmem_info.c +++ b/arch/s390/boot/physmem_info.c @@ -141,7 +141,7 @@ static int tprot(unsigned long addr) static unsigned long search_mem_end(void) { - unsigned long range = 1 << (MAX_PHYSMEM_BITS - 20); /* in 1MB blocks */ + unsigned long range = 1UL << (MAX_PHYSMEM_BITS - 20); /* in 1MB blocks */ unsigned long offset = 0; unsigned long pivot; |