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

[Thorsten Blum]

On Wed, Jul 29, 2026 at 06:56:59PM +0200, Thorsten Blum wrote:
> 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: stable@xxxxxxxxxxxxxxx
> > Signed-off-by: Thorsten Blum <thorsten.blum@xxxxxxxxx>
> > ---
> >  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.
> 
> Thanks,
> Thorsten

Interestingly, GCC 14.2.0 and Clang 22.1.8 don't report an error,
whereas GCC 16.1.1 does.