• Andy Grover's avatar
    RDS: Let rds_message_alloc_sgs() return NULL · d139ff09
    Andy Grover authored
    Even with the previous fix, we still are reading the iovecs once
    to determine SGs needed, and then again later on. Preallocating
    space for sg lists as part of rds_message seemed like a good idea
    but it might be better to not do this. While working to redo that
    code, this patch attempts to protect against userspace rewriting
    the rds_iovec array between the first and second accesses.
    
    The consequences of this would be either a too-small or too-large
    sg list array. Too large is not an issue. This patch changes all
    callers of message_alloc_sgs to handle running out of preallocated
    sgs, and fail gracefully.
    Signed-off-by: 's avatarAndy Grover <andy.grover@oracle.com>
    Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
    d139ff09
send.c 29.9 KB