[PATCH v2] qemu-hppa: lock both words of function descriptor

[Mikulas Patocka <mpatocka@redhat.com>]

On Sat, 16 Sep 2023, Helge Deller wrote:

> On 9/16/23 15:52, Mikulas Patocka wrote:
> > The code in setup_rt_frame reads two words at haddr, but locks only one.
> > This patch fixes it to lock both.
> >
> > Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
> >
> > ---
> >   linux-user/hppa/signal.c |    5 ++---
> >   1 file changed, 2 insertions(+), 3 deletions(-)
> >
> > Index: qemu/linux-user/hppa/signal.c
> > ===================================================================
> > --- qemu.orig/linux-user/hppa/signal.c
> > +++ qemu/linux-user/hppa/signal.c
> > @@ -149,12 +149,11 @@ void setup_rt_frame(int sig, struct targ
> >           target_ulong *fdesc, dest;
> >
> >           haddr &= -4;
> > -        if (!lock_user_struct(VERIFY_READ, fdesc, haddr, 1)) {
> > +        if (!(fdesc = lock_user(VERIFY_READ, haddr, 2 *
> > sizeof(target_ulong), 1)))
> >               goto give_sigsegv;
> > -        }
> 
> Patch is Ok, but I think the qemu coding style is to keep the { } braces, even
> if they are unnecessary (as in this case).
> 
> Acked-by: Helge Deller <deller@gmx.de>

OK, here I resend it:


From: Mikulas Patocka <mpatocka@redhat.com>

The code in setup_rt_frame reads two words at haddr, but locks only one.
This patch fixes it to lock both.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Helge Deller <deller@gmx.de>

---
 linux-user/hppa/signal.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: qemu/linux-user/hppa/signal.c
===================================================================
--- qemu.orig/linux-user/hppa/signal.c
+++ qemu/linux-user/hppa/signal.c
@@ -149,12 +149,12 @@ void setup_rt_frame(int sig, struct targ
         target_ulong *fdesc, dest;
 
         haddr &= -4;
-        if (!lock_user_struct(VERIFY_READ, fdesc, haddr, 1)) {
+        if (!(fdesc = lock_user(VERIFY_READ, haddr, 2 * sizeof(target_ulong), 1))) {
             goto give_sigsegv;
         }
         __get_user(dest, fdesc);
         __get_user(env->gr[19], fdesc + 1);
-        unlock_user_struct(fdesc, haddr, 1);
+        unlock_user(fdesc, haddr, 0);
         haddr = dest;
     }
     env->iaoq_f = haddr;