r8169: fix potential skb double free in an error path

[ Upstream commit cc6528bc9a0c901c83b8220a2e2617f3354d6dd9 ]

The caller of rtl8169_tso_csum_v2() frees the skb if false is returned.
eth_skb_pad() internally frees the skb on error what would result in a
double free. Therefore use __skb_put_padto() directly and instruct it
to not free the skb on error.

Fixes: b423e9ae49d7 ("r8169: fix offloaded tx checksum for small packets.")
Reported-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/f7e68191-acff-9ded-4263-c016428a8762@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index d8881ba773deea5a3f71484b313b0082ea9f3315..fd5adb0c54d2982035b175bdadec385f2407518c 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -5846,7 +5846,8 @@ static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp,
                opts[1] |= transport_offset << TCPHO_SHIFT;
        } else {
                if (unlikely(rtl_test_hw_pad_bug(tp, skb)))
-                       return !eth_skb_pad(skb);
+                       /* eth_skb_pad would free the skb on error */
+                       return !__skb_put_padto(skb, ETH_ZLEN, false);
        }
 
        return true;