[Qemu-devel] [PATCH] target/ppc: fix compile error in kvmppc_define_rtas_kernel_token()

["Cédric Le Goater" <clg@kaod.org>]

gcc9 reports :

In file included from /usr/include/string.h:494,
                 from ./include/qemu/osdep.h:101,
                 from ./target/ppc/kvm.c:17:
In function ‘strncpy’,
    inlined from ‘kvmppc_define_rtas_kernel_token’ at ./target/ppc/kvm.c:2648:5:
/usr/include/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ specified bound 120 equals destination size [-Werror=stringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/kvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index d4107dd70d21..9edf4abeaae7 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -2645,7 +2645,7 @@ int kvmppc_define_rtas_kernel_token(uint32_t token, const char *function)
         return -ENOENT;
     }
 
-    strncpy(args.name, function, sizeof(args.name));
+    strncpy(args.name, function, sizeof(args.name) - 1);
 
     return kvm_vm_ioctl(kvm_state, KVM_PPC_RTAS_DEFINE_TOKEN, &args);
 }
-- 
2.21.0