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The value of "offd" comes off the instance->rcv_buf[] and we used it as the offset into an array. The problem is that we check the upper bound but not for negative values. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>