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    Subject[PATCH 3.4 09/23] iovec: make sure the caller actually wants anything in memcpy_fromiovecend
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Sasha Levin <sasha.levin@oracle.com>

    [ Upstream commit 06ebb06d49486676272a3c030bfeef4bd969a8e6 ]

    Check for cases when the caller requests 0 bytes instead of running off
    and dereferencing potentially invalid iovecs.

    Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/core/iovec.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/net/core/iovec.c
    +++ b/net/core/iovec.c
    @@ -157,6 +157,10 @@ EXPORT_SYMBOL(memcpy_fromiovec);
    int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
    int offset, int len)
    {
    + /* No data? Done! */
    + if (len == 0)
    + return 0;
    +
    /* Skip over the finished iovecs */
    while (offset >= iov->iov_len) {
    offset -= iov->iov_len;



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