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    Subject[PATCH 4.14 82/88] r8169: Avoid memcpy() over-reading of ETH_SS_STATS
    Date
    From: Kees Cook <keescook@chromium.org>

    [ 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>
    ---
    drivers/net/ethernet/realtek/r8169.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
    index 530b8da11960..191531a03415 100644
    --- a/drivers/net/ethernet/realtek/r8169.c
    +++ b/drivers/net/ethernet/realtek/r8169.c
    @@ -2355,7 +2355,7 @@ 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;
    }
    }
    --
    2.30.2
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