[PATCH] powerpc/64: Fix build failure with GCC 8.1

[Christophe Leroy]

  CC      arch/powerpc/kernel/nvram_64.o
arch/powerpc/kernel/nvram_64.c: In function 'nvram_create_partition':
arch/powerpc/kernel/nvram_64.c:1042:2: error: 'strncpy' specified bound 12 
equals destination size [-Werror=stringop-truncation]
  strncpy(new_part->header.name, name, 12);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  CC      arch/powerpc/kernel/trace/ftrace.o
In function 'make_field',
    inlined from 'ps3_repository_read_boot_dat_address' at 
arch/powerpc/platforms/ps3/repository.c:900:9:
arch/powerpc/platforms/ps3/repository.c:106:2: error: 'strncpy' output 
truncated before terminating nul copying 8 bytes from a string of the same 
length [-Werror=stringop-truncation]
  strncpy((char *)&n, text, 8);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
 arch/powerpc/kernel/nvram_64.c          | 2 +-
 arch/powerpc/platforms/ps3/repository.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index ba681dac7b46..7507448cd904 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -1039,7 +1039,7 @@ loff_t __init nvram_create_partition(const char *name, 
int sig,
        new_part->index = free_part->index;
        new_part->header.signature = sig;
        new_part->header.length = size;
-       strncpy(new_part->header.name, name, 12);
+       strncpy(new_part->header.name, name, sizeof(new_part->header.name) - 1);
        new_part->header.checksum = nvram_checksum(&new_part->header);
 
        rc = nvram_write_header(new_part);
diff --git a/arch/powerpc/platforms/ps3/repository.c 
b/arch/powerpc/platforms/ps3/repository.c
index 50dbaf24b1ee..b4d6628eec5e 100644
--- a/arch/powerpc/platforms/ps3/repository.c
+++ b/arch/powerpc/platforms/ps3/repository.c
@@ -101,9 +101,9 @@ static u64 make_first_field(const char *text, u64 index)
 
 static u64 make_field(const char *text, u64 index)
 {
-       u64 n;
+       u64 n = 0;
 
-       strncpy((char *)&n, text, 8);
+       memcpy((char *)&n, text, min(sizeof(n), strlen(text)));
        return n + index;
 }
 
-- 
2.13.3