From: David S. Miller <davem@sunset.davemloft.net>
Date: Fri, 21 Jul 2006 21:12:39 +0000 (-0700)
Subject: [SPARC]: Fix length parameter verification in sys_getdomainname().
X-Git-Tag: v2.6.18-rc3~61
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=8310a32c15c76623bbe2425d38688a9d5b3e50a9;p=linux-2.6-omap-h63xx.git

[SPARC]: Fix length parameter verification in sys_getdomainname().

Found by scrashme.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc/kernel/sys_sparc.c b/arch/sparc/kernel/sys_sparc.c
index 0cdfc9d294b..a41c8a5c200 100644
--- a/arch/sparc/kernel/sys_sparc.c
+++ b/arch/sparc/kernel/sys_sparc.c
@@ -465,21 +465,21 @@ sys_rt_sigaction(int sig,
 
 asmlinkage int sys_getdomainname(char __user *name, int len)
 {
- 	int nlen;
- 	int err = -EFAULT;
+ 	int nlen, err;
  	
+	if (len < 0 || len > __NEW_UTS_LEN)
+		return -EINVAL;
+
  	down_read(&uts_sem);
  	
 	nlen = strlen(system_utsname.domainname) + 1;
-
 	if (nlen < len)
 		len = nlen;
-	if (len > __NEW_UTS_LEN)
-		goto done;
-	if (copy_to_user(name, system_utsname.domainname, len))
-		goto done;
-	err = 0;
-done:
+
+	err = -EFAULT;
+	if (!copy_to_user(name, system_utsname.domainname, len))
+		err = 0;
+
 	up_read(&uts_sem);
 	return err;
 }
diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c
index 51c056df528..054d0abdb7e 100644
--- a/arch/sparc64/kernel/sys_sparc.c
+++ b/arch/sparc64/kernel/sys_sparc.c
@@ -701,21 +701,21 @@ extern void check_pending(int signum);
 
 asmlinkage long sys_getdomainname(char __user *name, int len)
 {
-        int nlen;
-	int err = -EFAULT;
+        int nlen, err;
+
+	if (len < 0 || len > __NEW_UTS_LEN)
+		return -EINVAL;
 
  	down_read(&uts_sem);
  	
 	nlen = strlen(system_utsname.domainname) + 1;
-
         if (nlen < len)
                 len = nlen;
-	if (len > __NEW_UTS_LEN)
-		goto done;
-	if (copy_to_user(name, system_utsname.domainname, len))
-		goto done;
-	err = 0;
-done:
+
+	err = -EFAULT;
+	if (!copy_to_user(name, system_utsname.domainname, len))
+		err = 0;
+
 	up_read(&uts_sem);
 	return err;
 }