tun: fix recovery from gup errors

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / tun.c

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index bfa9bb48e42d5cfc06e299e64809e29ea3097b5b..9c61f8734a40c09e950505184e39232ead9fa938 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1010,8 +1010,10 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
                        return -EMSGSIZE;
                num_pages = get_user_pages_fast(base, size, 0, &page[i]);
                if (num_pages != size) {
-                       for (i = 0; i < num_pages; i++)
-                               put_page(page[i]);
+                       int j;
+
+                       for (j = 0; j < num_pages; j++)
+                               put_page(page[i + j]);
                        return -EFAULT;
                }
                truesize = size * PAGE_SIZE;