Check rx dma map was allocated before trying to free it, so we don't crash

if we ran out of memory while bringing the interface up.

tested by hrvoje, ok kevlo@

diff --git a/sys/dev/pci/if_ix.c b/sys/dev/pci/if_ix.c
index b250ee4..195b5d6 100644 (file)
--- a/sys/dev/pci/if_ix.c
+++ b/sys/dev/pci/if_ix.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_ix.c,v 1.197 2023/06/01 09:05:33 jan Exp $ */
+/*     $OpenBSD: if_ix.c,v 1.198 2023/07/08 09:01:30 jmatthew Exp $    */
 
 /******************************************************************************
 
@@ -3094,8 +3094,11 @@ ixgbe_free_receive_buffers(struct rx_ring *rxr)
                                m_freem(rxbuf->buf);
                                rxbuf->buf = NULL;
                        }
-                       bus_dmamap_destroy(rxr->rxdma.dma_tag, rxbuf->map);
-                       rxbuf->map = NULL;
+                       if (rxbuf->map != NULL) {
+                               bus_dmamap_destroy(rxr->rxdma.dma_tag,
+                                   rxbuf->map);
+                               rxbuf->map = NULL;
+                       }
                }
                free(rxr->rx_buffers, M_DEVBUF,
                    sc->num_rx_desc * sizeof(struct ixgbe_rx_buf));