• Catalin Marinas's avatar
    net: compat: Update get_compat_msghdr() to match copy_msghdr_from_user() behaviour · 91edd096
    Catalin Marinas authored
    Commit db31c55a (net: clamp ->msg_namelen instead of returning an
    error) introduced the clamping of msg_namelen when the unsigned value
    was larger than sizeof(struct sockaddr_storage). This caused a
    msg_namelen of -1 to be valid. The native code was subsequently fixed by
    commit dbb490b9 (net: socket: error on a negative msg_namelen).
    
    In addition, the native code sets msg_namelen to 0 when msg_name is
    NULL. This was done in commit (6a2a2b3a net:socket: set msg_namelen
    to 0 if msg_name is passed as NULL in msghdr struct from userland) and
    subsequently updated by 08adb7da (fold verify_iovec() into
    copy_msghdr_from_user()).
    
    This patch brings the get_compat_msghdr() in line with
    copy_msghdr_from_user().
    
    Fixes: db31c55a (net: clamp ->msg_namelen instead of returning an error)
    Cc: David S. Miller <davem@davemloft.net>
    Cc: Dan Carpenter <dan.carpenter@oracle.com>
    Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    91edd096
compat.c 24.1 KB