1 files changed, 3 insertions, 1 deletions

diff --git a/arch/um/kernel/exitcode.c b/arch/um/kernel/exitcode.c
index 829df49dee99..41ebbfebb333 100644
--- a/arch/um/kernel/exitcode.c
+++ b/arch/um/kernel/exitcode.c
@@ -40,9 +40,11 @@ static ssize_t exitcode_proc_write(struct file *file,
                 const char __user *buffer, size_t count, loff_t *pos)
 {
         char *end, buf[sizeof("nnnnn\0")];
+        size_t size;
         int tmp;
 
-        if (copy_from_user(buf, buffer, count))
+        size = min(count, sizeof(buf));
+        if (copy_from_user(buf, buffer, size))
                 return -EFAULT;
 
         tmp = simple_strtol(buf, &end, 0);