On Wed, Sep 15, 2021 at 12:47 AM Guenter Roeck <linux@xxxxxxxxxxxx> wrote: > > sparc64 images fail to compile with gcc 11.x, reporting the following > errors. > > arch/sparc/kernel/mdesc.c:647:22: error: > 'strcmp' reading 1 or more bytes from a region of size 0 > arch/sparc/kernel/mdesc.c:692:22: error: > 'strcmp' reading 1 or more bytes from a region of size 0 > arch/sparc/kernel/mdesc.c:719:21: > error: 'strcmp' reading 1 or more bytes from a region of size 0 > > The underlying problem is that node_block() returns a pointer beyond > the end of struct mdesc_hdr. gcc 11.x detects that and reports the error. > Adding an additional zero-length field to struct mdesc_hdr and pointing > to that field fixes the problem. > > Cc: Arnd Bergmann <arnd@xxxxxxxxxx> > Cc: David Laight <David.Laight@xxxxxxxxxx> > Cc: Anatoly Pugachev <matorola@xxxxxxxxx> > Cc: Sam Ravnborg <sam@xxxxxxxxxxxx> > Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> > --- > v2: data[0] => data[] > > I am not sure if there was agreement to accept this patch or not, but > I was asked to resend it with the above change, so here it is. An open > question was if it is acceptable to have a structure named xxx_hdr > include an element pointing to the data following that header. > Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
