netdev - [PATCH v2] vmxnet3: disable rx data ring on dma allocation failure

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Message-ID: <20240531103711.101961-1-mstocker@barracuda.com>
Date: Fri, 31 May 2024 12:37:11 +0200
From: Matthias Stocker <mstocker@...racuda.com>
To: kuba@...nel.org,
	doshir@...are.com,
	pv-drivers@...are.com,
	netdev@...r.kernel.org
Cc: Matthias Stocker <mstocker@...racuda.com>
Subject: [PATCH v2] vmxnet3: disable rx data ring on dma allocation failure

When vmxnet3_rq_create() fails to allocate memory for rq->data_ring.base,
the subsequent call to vmxnet3_rq_destroy_all_rxdataring does not reset
rq->data_ring.desc_size for the data ring that failed, which presumably
causes the hypervisor to reference it on packet reception.

To fix this bug, rq->data_ring.desc_size needs to be set to 0 to tell
the hypervisor to disable this feature.

[   95.436876] kernel BUG at net/core/skbuff.c:207!
[   95.439074] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[   95.440411] CPU: 7 PID: 0 Comm: swapper/7 Not tainted 6.9.3-dirty #1
[   95.441558] Hardware name: VMware, Inc. VMware Virtual
Platform/440BX Desktop Reference Platform, BIOS 6.00 12/12/2018
[   95.443481] RIP: 0010:skb_panic+0x4d/0x4f
[   95.444404] Code: 4f 70 50 8b 87 c0 00 00 00 50 8b 87 bc 00 00 00 50
ff b7 d0 00 00 00 4c 8b 8f c8 00 00 00 48 c7 c7 68 e8 be 9f e8 63 58 f9
ff <0f> 0b 48 8b 14 24 48 c7 c1 d0 73 65 9f e8 a1 ff ff ff 48 8b 14 24
[   95.447684] RSP: 0018:ffffa13340274dd0 EFLAGS: 00010246
[   95.448762] RAX: 0000000000000089 RBX: ffff8fbbc72b02d0 RCX: 000000000000083f
[   95.450148] RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
[   95.451520] RBP: 000000000000002d R08: 0000000000000000 R09: ffffa13340274c60
[   95.452886] R10: ffffffffa04ed468 R11: 0000000000000002 R12: 0000000000000000
[   95.454293] R13: ffff8fbbdab3c2d0 R14: ffff8fbbdbd829e0 R15: ffff8fbbdbd809e0
[   95.455682] FS:  0000000000000000(0000) GS:ffff8fbeefd80000(0000) knlGS:0000000000000000
[   95.457178] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   95.458340] CR2: 00007fd0d1f650c8 CR3: 0000000115f28000 CR4: 00000000000406f0
[   95.459791] Call Trace:
[   95.460515]  <IRQ>
[   95.461180]  ? __die_body.cold+0x19/0x27
[   95.462150]  ? die+0x2e/0x50
[   95.462976]  ? do_trap+0xca/0x110
[   95.463973]  ? do_error_trap+0x6a/0x90
[   95.464966]  ? skb_panic+0x4d/0x4f
[   95.465901]  ? exc_invalid_op+0x50/0x70
[   95.466849]  ? skb_panic+0x4d/0x4f
[   95.467718]  ? asm_exc_invalid_op+0x1a/0x20
[   95.468758]  ? skb_panic+0x4d/0x4f
[   95.469655]  skb_put.cold+0x10/0x10
[   95.470573]  vmxnet3_rq_rx_complete+0x862/0x11e0 [vmxnet3]
[   95.471853]  vmxnet3_poll_rx_only+0x36/0xb0 [vmxnet3]
[   95.473185]  __napi_poll+0x2b/0x160
[   95.474145]  net_rx_action+0x2c6/0x3b0
[   95.475115]  handle_softirqs+0xe7/0x2a0
[   95.476122]  __irq_exit_rcu+0x97/0xb0
[   95.477109]  common_interrupt+0x85/0xa0
[   95.478102]  </IRQ>
[   95.478846]  <TASK>
[   95.479603]  asm_common_interrupt+0x26/0x40
[   95.480657] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   95.481801] Code: 22 d7 e9 54 87 01 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 93 ba 3b 00 fb f4 <e9> 2c 87 01 00 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
[   95.485563] RSP: 0018:ffffa133400ffe58 EFLAGS: 00000246
[   95.486882] RAX: 0000000000004000 RBX: ffff8fbbc1d14064 RCX: 0000000000000000
[   95.488477] RDX: ffff8fbeefd80000 RSI: ffff8fbbc1d14000 RDI: 0000000000000001
[   95.490067] RBP: ffff8fbbc1d14064 R08: ffffffffa0652260 R09: 00000000000010d3
[   95.491683] R10: 0000000000000018 R11: ffff8fbeefdb4764 R12: ffffffffa0652260
[   95.493389] R13: ffffffffa06522e0 R14: 0000000000000001 R15: 0000000000000000
[   95.495035]  acpi_safe_halt+0x14/0x20
[   95.496127]  acpi_idle_do_entry+0x2f/0x50
[   95.497221]  acpi_idle_enter+0x7f/0xd0
[   95.498272]  cpuidle_enter_state+0x81/0x420
[   95.499375]  cpuidle_enter+0x2d/0x40
[   95.500400]  do_idle+0x1e5/0x240
[   95.501385]  cpu_startup_entry+0x29/0x30
[   95.502422]  start_secondary+0x11c/0x140
[   95.503454]  common_startup_64+0x13e/0x141
[   95.504466]  </TASK>
[   95.505197] Modules linked in: nft_fib_inet nft_fib_ipv4
nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6
nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6
nf_defrag_ipv4 rfkill ip_set nf_tables vsock_loopback
vmw_vsock_virtio_transport_common qrtr vmw_vsock_vmci_transport vsock
sunrpc binfmt_misc pktcdvd vmw_balloon pcspkr vmw_vmci i2c_piix4 joydev
loop dm_multipath nfnetlink zram crct10dif_pclmul crc32_pclmul vmwgfx
crc32c_intel polyval_clmulni polyval_generic ghash_clmulni_intel
sha512_ssse3 sha256_ssse3 vmxnet3 sha1_ssse3 drm_ttm_helper vmw_pvscsi
ttm ata_generic pata_acpi serio_raw scsi_dh_rdac scsi_dh_emc
scsi_dh_alua ip6_tables ip_tables fuse
[   95.516536] ---[ end trace 0000000000000000 ]---

Fixes: 6f4833383e85 ("net: vmxnet3: Fix NULL pointer dereference in vmxnet3_rq_rx_complete()")
Signed-off-by: Matthias Stocker <mstocker@...racuda.com>
---
 drivers/net/vmxnet3/vmxnet3_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index 0578864792b6..beebe09eb88f 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -2034,8 +2034,8 @@ vmxnet3_rq_destroy_all_rxdataring(struct vmxnet3_adapter *adapter)
 					  rq->data_ring.base,
 					  rq->data_ring.basePA);
 			rq->data_ring.base = NULL;
-			rq->data_ring.desc_size = 0;
 		}
+		rq->data_ring.desc_size = 0;
 	}
 }
 
-- 
2.45.1