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Subject[PATCH] drm: nouveau: use correct string length
Date
gcc-8 reports

drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c: In function 'nvkm_perfmon_mthd':
include/linux/string.h:265:9: error: '__builtin_strncpy' specified bound 64 equals destination size [-Werror=stringop-truncation]

We need one less byte or call strlcpy() to make it a
nul-terminated string.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
index dde89a4a0f5b..53859b6254d6 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
@@ -462,7 +462,7 @@ nvkm_perfmon_mthd_query_domain(struct nvkm_perfmon *perfmon,

args->v0.id = di;
args->v0.signal_nr = nvkm_perfdom_count_perfsig(dom);
- strncpy(args->v0.name, dom->name, sizeof(args->v0.name));
+ strncpy(args->v0.name, dom->name, sizeof(args->v0.name) - 1);

/* Currently only global counters (PCOUNTER) are implemented
* but this will be different for local counters (MP). */
@@ -514,7 +514,7 @@ nvkm_perfmon_mthd_query_signal(struct nvkm_perfmon *perfmon,
"/%s/%02x", dom->name, si);
} else {
strncpy(args->v0.name, sig->name,
- sizeof(args->v0.name));
+ sizeof(args->v0.name) - 1);
}

args->v0.signal = si;
@@ -572,7 +572,7 @@ nvkm_perfmon_mthd_query_source(struct nvkm_perfmon *perfmon,

args->v0.source = sig->source[si];
args->v0.mask = src->mask;
- strncpy(args->v0.name, src->name, sizeof(args->v0.name));
+ strncpy(args->v0.name, src->name, sizeof(args->v0.name) - 1);
}

if (++si < source_nr) {
--
2.9.0
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