r8169: Avoid memcpy() over-reading of ETH_SS_STATS

[ Upstream commit da5ac772cfe2a03058b0accfac03fad60c46c24d ]

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally reading across neighboring array fields.

The memcpy() is copying the entire structure, not just the first array.
Adjust the source argument so the compiler can do appropriate bounds
checking.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 3521e3a77556ddd1cdf10465ff57cfff5aacfaad..f321b115719a56e715ea1277a65ce2c02df02687 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -2338,7 +2338,7 @@ static void rtl8169_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 {
        switch(stringset) {
        case ETH_SS_STATS:
-               memcpy(data, *rtl8169_gstrings, sizeof(rtl8169_gstrings));
+               memcpy(data, rtl8169_gstrings, sizeof(rtl8169_gstrings));
                break;
        }
 }