x86, SGI UV: TLB shootdown using broadcast assist unit, v6

[pandora-kernel.git] / arch / x86 / kernel / tlb_uv.c

diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index b362913..c503b7f 100644 (file)
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -492,6 +492,8 @@ static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
        long newmode;
        char optstr[64];
 
+       if (count > 64)
+               return -EINVAL;
        if (copy_from_user(optstr, user, count))
                return -EFAULT;
        optstr[count - 1] = '\0';