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-rw-r--r--arch/ia64/sn/kernel/sn2/sn2_smp.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/ia64/sn/kernel/sn2/sn2_smp.c b/arch/ia64/sn/kernel/sn2/sn2_smp.c
index 49d3120415eb..e585f9a2afb9 100644
--- a/arch/ia64/sn/kernel/sn2/sn2_smp.c
+++ b/arch/ia64/sn/kernel/sn2/sn2_smp.c
@@ -512,6 +512,8 @@ static ssize_t sn2_ptc_proc_write(struct file *file, const char __user *user, si
int cpu;
char optstr[64];
+ if (count == 0 || count > sizeof(optstr))
+ return -EINVAL;
if (copy_from_user(optstr, user, count))
return -EFAULT;
optstr[count - 1] = '\0';