pid: fix mips irix emulation pid usage

[m.kozlowski@tuxland.pl: fix unbalanced parenthesis in irix_BSDsetpgrp()]
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 23 insertions, 19 deletions

diff --git a/arch/mips/kernel/irixelf.c b/arch/mips/kernel/irixelf.c
index 7852c7cdf29e..290d8e3a664d 100644
--- a/arch/mips/kernel/irixelf.c
+++ b/arch/mips/kernel/irixelf.c
@@ -591,9 +591,9 @@ static void irix_map_prda_page(void)
                 return;
 
         pp = (struct prda *) v;
-        pp->prda_sys.t_pid  = current->pid;
+        pp->prda_sys.t_pid  = task_pid_vnr(current);
         pp->prda_sys.t_prid = read_c0_prid();
-        pp->prda_sys.t_rpid = current->pid;
+        pp->prda_sys.t_rpid = task_pid_vnr(current);
 
         /* We leave the rest set to zero */
 }
@@ -1170,11 +1170,11 @@ static int irix_core_dump(long signr, struct pt_regs *regs, struct file *file, u
         prstatus.pr_info.si_signo = prstatus.pr_cursig = signr;
         prstatus.pr_sigpend = current->pending.signal.sig[0];
         prstatus.pr_sighold = current->blocked.sig[0];
-        psinfo.pr_pid = prstatus.pr_pid = current->pid;
-        psinfo.pr_ppid = prstatus.pr_ppid = current->parent->pid;
-        psinfo.pr_pgrp = prstatus.pr_pgrp = task_pgrp_nr(current);
-        psinfo.pr_sid = prstatus.pr_sid = task_session_nr(current);
-        if (current->pid == current->tgid) {
+        psinfo.pr_pid = prstatus.pr_pid = task_pid_vnr(current);
+        psinfo.pr_ppid = prstatus.pr_ppid = task_pid_vnr(current->parent);
+        psinfo.pr_pgrp = prstatus.pr_pgrp = task_pgrp_vnr(current);
+        psinfo.pr_sid = prstatus.pr_sid = task_session_vnr(current);
+        if (thread_group_leader(current)) {
                 /*
                  * This is the record for the group leader.  Add in the
                  * cumulative times of previous dead threads.  This total
diff --git a/arch/mips/kernel/irixsig.c b/arch/mips/kernel/irixsig.c
index 5b10ac133ec8..0215c805a592 100644
--- a/arch/mips/kernel/irixsig.c
+++ b/arch/mips/kernel/irixsig.c
@@ -578,10 +578,11 @@ out:
 
 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 
-asmlinkage int irix_waitsys(int type, int pid,
+asmlinkage int irix_waitsys(int type, int upid,
         struct irix5_siginfo __user *info, int options,
         struct rusage __user *ru)
 {
+        struct pid *pid = NULL;
         int flag, retval;
         DECLARE_WAITQUEUE(wait, current);
         struct task_struct *tsk;
@@ -604,6 +605,8 @@ asmlinkage int irix_waitsys(int type, int pid,
         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
                 return -EINVAL;
 
+        if (type != IRIX_P_ALL)
+                pid = find_get_pid(upid);
         add_wait_queue(&current->signal->wait_chldexit, &wait);
 repeat:
         flag = 0;
@@ -612,9 +615,9 @@ repeat:
         tsk = current;
         list_for_each(_p, &tsk->children) {
                 p = list_entry(_p, struct task_struct, sibling);
-                if ((type == IRIX_P_PID) && p->pid != pid)
+                if ((type == IRIX_P_PID) && task_pid(p) != pid)
                         continue;
-                if ((type == IRIX_P_PGID) && task_pgrp_nr(p) != pid)
+                if ((type == IRIX_P_PGID) && task_pgrp(p) != pid)
                         continue;
                 if ((p->exit_signal != SIGCHLD))
                         continue;
@@ -639,7 +642,7 @@ repeat:
 
                         retval = __put_user(SIGCHLD, &info->sig);
                         retval |= __put_user(0, &info->code);
-                        retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
+                        retval |= __put_user(task_pid_vnr(p), &info->stuff.procinfo.pid);
                         retval |= __put_user((p->exit_code >> 8) & 0xff,
                                    &info->stuff.procinfo.procdata.child.status);
                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
@@ -657,7 +660,7 @@ repeat:
                                 getrusage(p, RUSAGE_BOTH, ru);
                         retval = __put_user(SIGCHLD, &info->sig);
                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
-                        retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
+                        retval |= __put_user(task_pid_vnr(p), &info->stuff.procinfo.pid);
                         retval |= __put_user((p->exit_code >> 8) & 0xff,
                                    &info->stuff.procinfo.procdata.child.status);
                         retval |= __put_user(p->utime,
@@ -665,7 +668,7 @@ repeat:
                         retval |= __put_user(p->stime,
                                    &info->stuff.procinfo.procdata.child.stime);
                         if (retval)
-                                return retval;
+                                goto end_waitsys;
 
                         if (p->real_parent != p->parent) {
                                 write_lock_irq(&tasklist_lock);
@@ -698,6 +701,7 @@ repeat:
 end_waitsys:
         current->state = TASK_RUNNING;
         remove_wait_queue(&current->signal->wait_chldexit, &wait);
+        put_pid(pid);
 
         return retval;
 }
diff --git a/arch/mips/kernel/sysirix.c b/arch/mips/kernel/sysirix.c
index 22fd41e946b2..d70c4e0e85fb 100644
--- a/arch/mips/kernel/sysirix.c
+++ b/arch/mips/kernel/sysirix.c
@@ -582,8 +582,8 @@ out:
 
 asmlinkage int irix_getpid(struct pt_regs *regs)
 {
-        regs->regs[3] = current->real_parent->pid;
-        return current->pid;
+        regs->regs[3] = task_pid_vnr(current->real_parent);
+        return task_pid_vnr(current);
 }
 
 asmlinkage int irix_getuid(struct pt_regs *regs)
@@ -763,11 +763,11 @@ asmlinkage int irix_setpgrp(int flags)
         printk("[%s:%d] setpgrp(%d) ", current->comm, current->pid, flags);
 #endif
         if(!flags)
-                error = task_pgrp_nr(current);
+                error = task_pgrp_vnr(current);
         else
                 error = sys_setsid();
 #ifdef DEBUG_PROCGRPS
-        printk("returning %d\n", task_pgrp_nr(current));
+        printk("returning %d\n", error);
 #endif
 
         return error;
@@ -1093,10 +1093,10 @@ asmlinkage int irix_BSDsetpgrp(int pid, int pgrp)
                pid, pgrp);
 #endif
         if(!pid)
-                pid = current->pid;
+                pid = task_pid_vnr(current);
 
         /* Wheee, weird sysv thing... */
-        if ((pgrp == 0) && (pid == current->pid))
+        if ((pgrp == 0) && (pid == task_pid_vnr(current)))
                 error = sys_setsid();
         else
                 error = sys_setpgid(pid, pgrp);