m32r: don't block signals if sigframe setup has failed

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

1 files changed, 13 insertions, 10 deletions

diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c
index db152263484f..a56fcbd8abe6 100644
--- a/arch/m32r/kernel/signal.c
+++ b/arch/m32r/kernel/signal.c
@@ -187,7 +187,7 @@ get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
         return (void __user *)((sp - frame_size) & -8ul);
 }
 
-static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                            sigset_t *set, struct pt_regs *regs)
 {
         struct rt_sigframe __user *frame;
@@ -244,17 +244,18 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                 current->comm, current->pid, frame, regs->pc);
 #endif
 
-        return;
+        return 0;
 
 give_sigsegv:
         force_sigsegv(sig, current);
+        return -EFAULT;
 }
 
 /*
  * OK, we're invoking a handler
  */
 
-static void
+static int
 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
               sigset_t *oldset, struct pt_regs *regs)
 {
@@ -287,7 +288,8 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
         }
 
         /* Set up the stack frame */
-        setup_rt_frame(sig, ka, info, oldset, regs);
+        if (setup_rt_frame(sig, ka, info, oldset, regs))
+                return -EFAULT;
 
         spin_lock_irq(&current->sighand->siglock);
         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
@@ -295,6 +297,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
                 sigaddset(&current->blocked,sig);
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
+        return 0;
 }
 
 /*
@@ -302,7 +305,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
  * want to handle. Thus you cannot kill init even with a SIGKILL even by
  * mistake.
  */
-static int do_signal(struct pt_regs *regs)
+static void do_signal(struct pt_regs *regs)
 {
         siginfo_t info;
         int signr;
@@ -317,7 +320,7 @@ static int do_signal(struct pt_regs *regs)
          * if so.
          */
         if (!user_mode(regs))
-                return 1;
+                return;
 
         if (try_to_freeze()) 
                 goto no_signal;
@@ -336,9 +339,10 @@ static int do_signal(struct pt_regs *regs)
                  */
 
                 /* Whee!  Actually deliver the signal.  */
-                handle_signal(signr, &ka, &info, oldset, regs);
-                clear_thread_flag(TIF_RESTORE_SIGMASK);
-                return 1;
+                if (handle_signal(signr, &ka, &info, oldset, regs) == 0)
+                        clear_thread_flag(TIF_RESTORE_SIGMASK);
+
+                return;
         }
 
  no_signal:
@@ -370,7 +374,6 @@ static int do_signal(struct pt_regs *regs)
                 clear_thread_flag(TIF_RESTORE_SIGMASK);
                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
         }
-        return 0;
 }
 
 /*