[SPARC]: Fix regression in sys_getdomainname()
This patch corrects the buffer length checking in the
sys_getdomainname() implementation for sparc/sparc64.
Signed-off-by: Andy Walker <andy@puszczka.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c
index bf5f14e..c608c94 100644
--- a/arch/sparc64/kernel/sys_sparc.c
+++ b/arch/sparc64/kernel/sys_sparc.c
@@ -707,19 +707,21 @@
{
int nlen, err;
- if (len < 0 || len > __NEW_UTS_LEN)
+ if (len < 0)
return -EINVAL;
down_read(&uts_sem);
nlen = strlen(system_utsname.domainname) + 1;
- if (nlen < len)
- len = nlen;
+ err = -EINVAL;
+ if (nlen > len)
+ goto out;
err = -EFAULT;
- if (!copy_to_user(name, system_utsname.domainname, len))
+ if (!copy_to_user(name, system_utsname.domainname, nlen))
err = 0;
+out:
up_read(&uts_sem);
return err;
}