diff options
| author | wpaul <wpaul@FreeBSD.org> | 1998-12-05 02:21:44 +0000 |
|---|---|---|
| committer | wpaul <wpaul@FreeBSD.org> | 1998-12-05 02:21:44 +0000 |
| commit | f72fa84f9303d83d38279ea0ca986be9cf5a47b2 (patch) | |
| tree | 0abdc409e63b6d3111833f2d1477f54d712bb151 /sys/dev/vr | |
| parent | ad9bd899c9e5b7048ee2ff9a5c9943d40dd4a0a4 (diff) | |
| download | FreeBSD-src-f72fa84f9303d83d38279ea0ca986be9cf5a47b2.zip FreeBSD-src-f72fa84f9303d83d38279ea0ca986be9cf5a47b2.tar.gz | |
Add sanity check to foo_start() routines: in the unlikely (though
apparently possible) event that the transmit start routine is
called with and empty if_snd queue, bail out instead of dereferencing
unilitialized transmit list pointers and panicking.
Diffstat (limited to 'sys/dev/vr')
| -rw-r--r-- | sys/dev/vr/if_vr.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/sys/dev/vr/if_vr.c b/sys/dev/vr/if_vr.c index a5a2fc4..a96d14c 100644 --- a/sys/dev/vr/if_vr.c +++ b/sys/dev/vr/if_vr.c @@ -29,7 +29,7 @@ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. * - * $Id: if_vr.c,v 1.13 1998/12/01 22:08:11 wpaul Exp $ + * $Id: if_vr.c,v 1.1 1998/12/04 18:01:21 wpaul Exp $ */ /* @@ -97,7 +97,7 @@ #ifndef lint static char rcsid[] = - "$Id: if_vr.c,v 1.13 1998/12/01 22:08:11 wpaul Exp $"; + "$Id: if_vr.c,v 1.1 1998/12/04 18:01:21 wpaul Exp $"; #endif /* @@ -1627,6 +1627,12 @@ static void vr_start(ifp) } /* + * If there are no frames queued, bail. + */ + if (cur_tx == NULL) + return; + + /* * Place the request for the upload interrupt * in the last descriptor in the chain. This way, if * we're chaining several packets at once, we'll only |
