1 files changed, 1 insertions, 1 deletions

diff --git a/arch/ia64/sn/kernel/sn2/sn2_smp.c b/arch/ia64/sn/kernel/sn2/sn2_smp.c
index 6dd886c5d860..e585f9a2afb9 100644
--- a/arch/ia64/sn/kernel/sn2/sn2_smp.c
+++ b/arch/ia64/sn/kernel/sn2/sn2_smp.c
@@ -512,7 +512,7 @@ static ssize_t sn2_ptc_proc_write(struct file *file, const char __user *user, si
         int cpu;
         char optstr[64];
 
-        if (count > sizeof(optstr))
+        if (count == 0 || count > sizeof(optstr))
                 return -EINVAL;
         if (copy_from_user(optstr, user, count))
                 return -EFAULT;