X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fsys.c;h=14e97282eb6c941605913dc68c2d4e2778cbe3b6;hb=d559d4a24a3fed75bd890abcc1f95cd8d8dad6e1;hp=ddd28e261f3a06d8fc47d35d6eae5c4bcd2a9d8a;hpb=1dd768c0815334d2319d6377f0750ace075b6142;p=linux-2.6

diff --git a/kernel/sys.c b/kernel/sys.c
index ddd28e261f..14e97282eb 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -991,31 +991,37 @@ out:
 
 asmlinkage long sys_getpgid(pid_t pid)
 {
+	struct task_struct *p;
+	struct pid *grp;
+	int retval;
+
+	rcu_read_lock();
 	if (!pid)
-		return task_pgrp_vnr(current);
+		grp = task_pgrp(current);
 	else {
-		int retval;
-		struct task_struct *p;
-
-		read_lock(&tasklist_lock);
-		p = find_task_by_vpid(pid);
 		retval = -ESRCH;
-		if (p) {
-			retval = security_task_getpgid(p);
-			if (!retval)
-				retval = task_pgrp_vnr(p);
-		}
-		read_unlock(&tasklist_lock);
-		return retval;
+		p = find_task_by_vpid(pid);
+		if (!p)
+			goto out;
+		grp = task_pgrp(p);
+		if (!grp)
+			goto out;
+
+		retval = security_task_getpgid(p);
+		if (retval)
+			goto out;
 	}
+	retval = pid_vnr(grp);
+out:
+	rcu_read_unlock();
+	return retval;
 }
 
 #ifdef __ARCH_WANT_SYS_GETPGRP
 
 asmlinkage long sys_getpgrp(void)
 {
-	/* SMP - assuming writes are word atomic this is fine */
-	return task_pgrp_vnr(current);
+	return sys_getpgid(0);
 }
 
 #endif
@@ -1646,7 +1652,7 @@ asmlinkage long sys_umask(int mask)
 asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 			  unsigned long arg4, unsigned long arg5)
 {
-	long uninitialized_var(error);
+	long error = 0;
 
 	if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error))
 		return error;
@@ -1695,9 +1701,7 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 			error = PR_TIMING_STATISTICAL;
 			break;
 		case PR_SET_TIMING:
-			if (arg2 == PR_TIMING_STATISTICAL)
-				error = 0;
-			else
+			if (arg2 != PR_TIMING_STATISTICAL)
 				error = -EINVAL;
 			break;