[Qemu-devel] [PATCH 02/13] signal.c setup_frame/x86: __put_user cleanup

[riku . voipio]

From: Riku Voipio <address@hidden>

Remove the remaining check for __put_user return
value, and all the checks for err variable which
is no longer set anywhere.

Now we can only end up in give_sigsegv due to failed
lock_user_struct - thus we remove the unlock_user_struct
to avoid unlocking a region never locked.

Signed-off-by: Riku Voipio <address@hidden>
---
 linux-user/signal.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 4155cac..f261383 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -911,7 +911,7 @@ static void setup_frame(int sig, struct target_sigaction 
*ka,
 {
        abi_ulong frame_addr;
        struct sigframe *frame;
-       int i, err = 0;
+       int i;
 
        frame_addr = get_sigframe(ka, env, sizeof(*frame));
 
@@ -920,18 +920,13 @@ static void setup_frame(int sig, struct target_sigaction 
*ka,
 
     __put_user(current_exec_domain_sig(sig),
                &frame->sig);
-       if (err)
-               goto give_sigsegv;
 
        setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0],
                          frame_addr + offsetof(struct sigframe, fpstate));
-       if (err)
-               goto give_sigsegv;
 
-        for(i = 1; i < TARGET_NSIG_WORDS; i++) {
-            if (__put_user(set->sig[i], &frame->extramask[i - 1]))
-                goto give_sigsegv;
-        }
+    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
+        __put_user(set->sig[i], &frame->extramask[i - 1]);
+    }
 
        /* Set up to return from userspace.  If provided, use a stub
           already in userspace.  */
@@ -950,8 +945,6 @@ static void setup_frame(int sig, struct target_sigaction 
*ka,
         __put_user(val16, (uint16_t *)(frame->retcode+6));
        }
 
-       if (err)
-               goto give_sigsegv;
 
        /* Set up registers for signal handler */
        env->regs[R_ESP] = frame_addr;
@@ -968,7 +961,6 @@ static void setup_frame(int sig, struct target_sigaction 
*ka,
        return;
 
 give_sigsegv:
-       unlock_user_struct(frame, frame_addr, 1);
        if (sig == TARGET_SIGSEGV)
                ka->_sa_handler = TARGET_SIG_DFL;
        force_sig(TARGET_SIGSEGV /* , current */);
-- 
1.9.2