# \[PATCH\] video/hdmi: prefer strlcpy to strncpy

- Subsystems: FRAMEBUFFER LAYER, THE REST
- Maintainers: Helge Deller, Linus Torvalds
- List: linux-fbdev
- 2 messages, 1 author
- Page: https://ratatoskr.run/linux-fbdev/2018/05/5295259/t

## \[PATCH\] video/hdmi: prefer strlcpy to strncpy

- From: Nick Desaulniers \<hidden\>
- Date: 2018-05-29 06:59:16 
- Message: https://ratatoskr.run/linux-fbdev/2018/05/5295259.md

```text
Fixes a stringop-truncation warning from gcc-8.

Signed-off-by: Nick Desaulniers <redacted>
---
 drivers/video/hdmi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 111a0ab..46c184c 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -168,8 +168,8 @@ int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
 	frame->version = 1;
 	frame->length = HDMI_SPD_INFOFRAME_SIZE;
 
-	strncpy(frame->vendor, vendor, sizeof(frame->vendor));
-	strncpy(frame->product, product, sizeof(frame->product));
+	strlcpy(frame->vendor, vendor, sizeof(frame->vendor));
+	strlcpy(frame->product, product, sizeof(frame->product));
 
 	return 0;
 }
-- 
2.7.4

```

## Re: \[PATCH\] video/hdmi: prefer strlcpy to strncpy

- From: Nick Desaulniers \<hidden\>
- Date: 2018-05-30 01:58:44 
- Message: https://ratatoskr.run/linux-fbdev/2018/05/5296321.md

```text
On Mon, May 28, 2018 at 11:59 PM, Nick Desaulniers
[ref] wrote:
> Fixes a stringop-truncation warning from gcc-8.
>
> Signed-off-by: Nick Desaulniers <redacted>
> ---
>  drivers/video/hdmi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
> index 111a0ab..46c184c 100644
> --- a/drivers/video/hdmi.c
> +++ b/drivers/video/hdmi.c
> @@ -168,8 +168,8 @@ int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
>         frame->version = 1;
>         frame->length = HDMI_SPD_INFOFRAME_SIZE;
>
> -       strncpy(frame->vendor, vendor, sizeof(frame->vendor));
> -       strncpy(frame->product, product, sizeof(frame->product));
> +       strlcpy(frame->vendor, vendor, sizeof(frame->vendor));
> +       strlcpy(frame->product, product, sizeof(frame->product));
>
>         return 0;
>  }
> --
> 2.7.4
>

Eric points out this can leak kernel memory if size is less than length of src.
```