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iflib: Free resources in a consistent order during detach

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Memory and PCI resources are freed with no particular order.  This could
cause use-after-frees when detaching following a failed attach.  For
instance, iflib_tx_structures_free() frees ctx->ifc_txqs[] but
iflib_tqg_detach() attempts to access this array. Similarly, adapter
queues gets freed by IFDI_QUEUES_FREE() but IFDI_DETACH() attempts to
access adapter queues to free PCI resources.

MFC after:	2 weeks
Sponsored by:	NetApp, Inc.
Differential Revision:	https://reviews.freebsd.org/D27634
This commit is contained in:
Sai Rajesh Tallamraju 2021-02-01 11:13:00 -05:00 committed by Mark Johnston
parent 45ecda8ebf
commit 38bfc6dee3
3 changed files with 20 additions and 23 deletions
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19
sys/dev/e1000/if_em.c
View File

@ -1102,10 +1102,11 @@ em_if_attach_post(if_ctx_t ctx)
struct adapter *adapter = iflib_get_softc(ctx);
struct e1000_hw *hw = &adapter->hw;
int error = 0;
/* Setup OS specific network interface */
error = em_setup_interface(ctx);
if (error != 0) {
device_printf(adapter->dev, "Interface setup failed: %d\n", error);
goto err_late;
}
@ -1123,14 +1124,10 @@ em_if_attach_post(if_ctx_t ctx)
INIT_DEBUGOUT("em_if_attach_post: end");
return (error);
return (0);
err_late:
em_release_hw_control(adapter);
em_free_pci_resources(ctx);
em_if_queues_free(ctx);
free(adapter->mta, M_DEVBUF);
/* upon attach_post() error, iflib calls _if_detach() to free resources. */
return (error);
}
@ -1155,6 +1152,8 @@ em_if_detach(if_ctx_t ctx)
em_release_manageability(adapter);
em_release_hw_control(adapter);
em_free_pci_resources(ctx);
free(adapter->mta, M_DEVBUF);
adapter->mta = NULL;
return (0);
}
@ -2981,12 +2980,6 @@ em_if_queues_free(if_ctx_t ctx)
free(adapter->rx_queues, M_DEVBUF);
adapter->rx_queues = NULL;
}
em_release_hw_control(adapter);
if (adapter->mta != NULL) {
free(adapter->mta, M_DEVBUF);
}
}
/*********************************************************************

2
sys/dev/ixl/if_ixl.c
View File

@ -1253,7 +1253,7 @@ ixl_if_queues_free(if_ctx_t ctx)
struct ixl_pf *pf = iflib_get_softc(ctx);
struct ixl_vsi *vsi = &pf->vsi;
if (!vsi->enable_head_writeback) {
if (vsi->tx_queues != NULL && !vsi->enable_head_writeback) {
struct ixl_tx_queue *que;
int i = 0;

22
sys/net/iflib.c
View File

@ -4900,7 +4900,7 @@ iflib_device_register(device_t dev, void *sc, if_shared_ctx_t sctx, if_ctx_t *ct
device_printf(dev,
"Cannot use iflib with only 1 MSI-X interrupt!\n");
err = ENODEV;
goto fail_intr_free;
goto fail_queues;
}
ether_ifattach(ctx->ifc_ifp, ctx->ifc_mac.octet);
@ -4936,13 +4936,14 @@ iflib_device_register(device_t dev, void *sc, if_shared_ctx_t sctx, if_ctx_t *ct
fail_detach:
ether_ifdetach(ctx->ifc_ifp);
fail_intr_free:
iflib_free_intr_mem(ctx);
fail_queues:
iflib_tqg_detach(ctx);
iflib_tx_structures_free(ctx);
iflib_rx_structures_free(ctx);
iflib_tqg_detach(ctx);
IFDI_DETACH(ctx);
IFDI_QUEUES_FREE(ctx);
fail_intr_free:
iflib_free_intr_mem(ctx);
fail_unlock:
CTX_UNLOCK(ctx);
iflib_deregister(ctx);
@ -5139,11 +5140,12 @@ iflib_pseudo_register(device_t dev, if_shared_ctx_t sctx, if_ctx_t *ctxp,
fail_detach:
ether_ifdetach(ctx->ifc_ifp);
fail_queues:
iflib_tqg_detach(ctx);
iflib_tx_structures_free(ctx);
iflib_rx_structures_free(ctx);
iflib_tqg_detach(ctx);
fail_iflib_detach:
IFDI_DETACH(ctx);
IFDI_QUEUES_FREE(ctx);
fail_unlock:
CTX_UNLOCK(ctx);
iflib_deregister(ctx);
@ -5173,6 +5175,8 @@ iflib_pseudo_deregister(if_ctx_t ctx)
iflib_tqg_detach(ctx);
iflib_tx_structures_free(ctx);
iflib_rx_structures_free(ctx);
IFDI_DETACH(ctx);
IFDI_QUEUES_FREE(ctx);
iflib_deregister(ctx);
@ -5233,8 +5237,12 @@ iflib_device_deregister(if_ctx_t ctx)
led_destroy(ctx->ifc_led_dev);
iflib_tqg_detach(ctx);
iflib_tx_structures_free(ctx);
iflib_rx_structures_free(ctx);
CTX_LOCK(ctx);
IFDI_DETACH(ctx);
IFDI_QUEUES_FREE(ctx);
CTX_UNLOCK(ctx);
/* ether_ifdetach calls if_qflush - lock must be destroy afterwards*/
@ -5242,9 +5250,6 @@ iflib_device_deregister(if_ctx_t ctx)
bus_generic_detach(dev);
iflib_tx_structures_free(ctx);
iflib_rx_structures_free(ctx);
iflib_deregister(ctx);
device_set_softc(ctx->ifc_dev, NULL);
@ -5828,7 +5833,6 @@ iflib_tx_structures_free(if_ctx_t ctx)
}
free(ctx->ifc_txqs, M_IFLIB);
ctx->ifc_txqs = NULL;
IFDI_QUEUES_FREE(ctx);
}
/*********************************************************************