sparc: missing checks of __get_user()/__put_user() return values

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sparc/kernel/signal32.c

@@ -215,8 +215,9 @@ void do_sigreturn32(struct pt_regs *regs)
 	    (((unsigned long) sf) & 3))
 		goto segv;
 
-	get_user(pc, &sf->info.si_regs.pc);
-	__get_user(npc, &sf->info.si_regs.npc);
+	if (get_user(pc, &sf->info.si_regs.pc) ||
+	    __get_user(npc, &sf->info.si_regs.npc))
+		goto segv;
 
 	if ((pc | npc) & 3)
 		goto segv;
@@ -305,8 +306,9 @@ asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
 	    (((unsigned long) sf) & 3))
 		goto segv;
 
-	get_user(pc, &sf->regs.pc);
-	__get_user(npc, &sf->regs.npc);
+	if (get_user(pc, &sf->regs.pc) || 
+	    __get_user(npc, &sf->regs.npc))
+		goto segv;
 
 	if ((pc | npc) & 3)
 		goto segv;

arch/sparc/kernel/sys_sparc_32.c

@@ -184,10 +184,10 @@ sparc_sigaction (int sig, const struct old_sigaction __user *act,
 
 		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
+		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
+		    __get_user(mask, &act->sa_mask))
 			return -EFAULT;
-		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
-		__get_user(mask, &act->sa_mask);
 		siginitset(&new_ka.sa.sa_mask, mask);
 		new_ka.ka_restorer = NULL;
 	}
@@ -202,10 +202,10 @@ sparc_sigaction (int sig, const struct old_sigaction __user *act,
 		 */
 		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
+		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
+		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 			return -EFAULT;
-		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 	}
 
 	return ret;