Re: [PATCH] powerpc/ps3: Fix repository.c build failure

On Fri, Jul 03, 2026 at 06:58:35PM +0200, Thorsten Blum wrote:
> GCC fails to build ps3_defconfig with the following errors:
> 
>   arch/powerpc/platforms/ps3/repository.c: In function ‘make_first_field.constprop’:
>   arch/powerpc/platforms/ps3/repository.c:78:9: error: ‘strnlen’ specified bound 8 exceeds source size 3 [-Werror=stringop-overread]
>      78 |         memcpy((char *)&n, text, strnlen(text, sizeof(n)));
>         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   arch/powerpc/platforms/ps3/repository.c: In function ‘make_first_field.constprop’:
>   arch/powerpc/platforms/ps3/repository.c:78:9: error: ‘strnlen’ specified bound 8 exceeds source size 4 [-Werror=stringop-overread]
>      78 |         memcpy((char *)&n, text, strnlen(text, sizeof(n)));
>         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> The current use of strnlen(text, sizeof(n)) triggers -Wstringop-overread
> when text is a short string literal that is smaller than sizeof(n), such
> as "bi" or "bus". Use strlen(text) instead and clamp the copy length to
> sizeof(n) before memcpy().
> 
> Drop the redundant char * cast while at it.
> 
> Fixes: f94a84a09148 ("powerpc/ps3: refactor strncpy usage")
> Cc: [email protected]
> Signed-off-by: Thorsten Blum <[email protected]>
> ---
>  arch/powerpc/platforms/ps3/repository.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/platforms/ps3/repository.c b/arch/powerpc/platforms/ps3/repository.c
> index b8c030eab138..0cc755ac3e7f 100644
> --- a/arch/powerpc/platforms/ps3/repository.c
> +++ b/arch/powerpc/platforms/ps3/repository.c
> @@ -6,6 +6,8 @@
>   *  Copyright 2006 Sony Corp.
>   */
>  
> +#include <linux/minmax.h>
> +
>  #include <asm/lv1call.h>
>  
>  #include "platform.h"
> @@ -74,8 +76,9 @@ static void _dump_node(unsigned int lpar_id, u64 n1, u64 n2, u64 n3, u64 n4,
>  static u64 make_first_field(const char *text, u64 index)
>  {
>  	u64 n = 0;
> +	size_t len = min(strlen(text), sizeof(n));
>  
> -	memcpy((char *)&n, text, strnlen(text, sizeof(n)));
> +	memcpy(&n, text, len);
>  	return PS3_VENDOR_ID_NONE + (n >> 32) + index;
>  }
>  

Gentle ping - it's been a few weeks and the build failure is still
present. Is the approach here ok or would you prefer something else?

Thanks,
Thorsten