2019-03-28 08:11:44

by Bo YU

Subject: [PATCH v2] drm: etnaviv: fix strncpy sizeof argument

Calling strncpy with a maximum size argument of 64 bytes on destination
array "domain->name" of size 64 bytes might leave the destination string
unterminated.

Detected by CoverityScan, CID# 1443992: Memory - illegal accesses (BUFFER_SIZE_WARNING)

Fixes: 9e2c2e2730126 (drm/etnaviv: add infrastructure to query perf counter)
Signed-off-by: Bo YU <[email protected]>
---
v2: accroding to Russell's suggestion, replace strncpy with strlcpy
---
drivers/gpu/drm/etnaviv/etnaviv_perfmon.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
index 4227a4006c34..ce178f23e86a 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
@@ -414,7 +414,7 @@ int etnaviv_pm_query_dom(struct etnaviv_gpu *gpu,

domain->id = domain->iter;
domain->nr_signals = dom->nr_signals;
- strncpy(domain->name, dom->name, sizeof(domain->name));
+ strlcpy(domain->name, dom->name, sizeof(domain->name));

domain->iter++;
if (domain->iter == meta->nr_domains)
--
2.11.0

2019-04-02 01:36:41

by Bo YU

Subject: Re: [PATCH v2] drm: etnaviv: fix strncpy sizeof argument

On Thu, Mar 28, 2019 at 4:09 PM Bo YU <[email protected]> wrote:
>
> Calling strncpy with a maximum size argument of 64 bytes on destination
> array "domain->name" of size 64 bytes might leave the destination string
> unterminated.
>
> Detected by CoverityScan, CID# 1443992: Memory - illegal accesses (BUFFER_SIZE_WARNING)
>
> Fixes: 9e2c2e2730126 (drm/etnaviv: add infrastructure to query perf counter)
> Signed-off-by: Bo YU <[email protected]>
> ---
> v2: accroding to Russell's suggestion, replace strncpy with strlcpy
> ---
> drivers/gpu/drm/etnaviv/etnaviv_perfmon.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
> index 4227a4006c34..ce178f23e86a 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
> @@ -414,7 +414,7 @@ int etnaviv_pm_query_dom(struct etnaviv_gpu *gpu,
>
> domain->id = domain->iter;
> domain->nr_signals = dom->nr_signals;
> - strncpy(domain->name, dom->name, sizeof(domain->name));
> + strlcpy(domain->name, dom->name, sizeof(domain->name));
>
> domain->iter++;
> if (domain->iter == meta->nr_domains)
> --
> 2.11.0
>
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