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If the device is in an incorrect state, the driver may mistakenly enter this branch. At this time, the dma buffer has not been allocated, which will result in a null pointer dereference. Fix this by checking whether the buffer is allocated. This log reveals it: BUG: kernel NULL pointer dereference, address: 0000000000000070 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 5 PID: 0 Comm: swapper/5 Not tainted 5.12.4-g70e7f0549188-dirty #88 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:_vortex_interrupt+0x323/0x670 Code: 84 d4 00 00 00 e8 bd e9 60 fe 48 8b 45 d8 48 83 c0 0c 48 89 c6 bf 00 10 00 00 e8 98 d0 f0 fe 48 8b 45 d0 48 8b 80 d8 01 00 00 <8b> 40 70 83 c0 03 89 c0 83 e0 fc 48 89 c2 48 8b 45 d0 48 8b b0 e0 RSP: 0018:ffffc900001a4dd0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888115da0580 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81bf710e RDI: 0000000000001000 RBP: ffffc900001a4e30 R08: ffff8881008edbc0 R09: 00000000fffffffe R10: 0000000000000001 R11: 00000000a5c81234 R12: ffff8881049530a8 R13: 0000000000000000 R14: ffffffff87313288 R15: ffff888108c92000 FS: 0000000000000000(0000) GS:ffff88817b200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000070 CR3: 00000001198c2000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? _raw_spin_lock_irqsave+0x81/0xa0 vortex_boomerang_interrupt+0x56/0xc10 ? __this_cpu_preempt_check+0x1c/0x20 __handle_irq_event_percpu+0x58/0x3e0 handle_irq_event_percpu+0x3a/0x90 handle_irq_event+0x3e/0x60 handle_fasteoi_irq+0xc7/0x1d0 __common_interrupt+0x84/0x150 common_interrupt+0xb4/0xd0 asm_common_interrupt+0x1e/0x40 RIP: 0010:native_safe_halt+0x17/0x20 Code: 07 0f 00 2d 3b 3e 4b 00 f4 5d c3 0f 1f 84 00 00 00 00 00 8b 05 42 a9 72 02 55 48 89 e5 85 c0 7e 07 0f 00 2d 1b 3e 4b 00 fb f4 <5d> c3 cc cc cc cc cc cc cc 0f 1f 44 00 00 55 48 89 e5 e8 92 4a ff RSP: 0018:ffffc900000afe90 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8666cafb RDI: ffffffff865058de RBP: ffffc900000afe90 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff87313288 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881008ed1c0 default_idle+0xe/0x20 arch_cpu_idle+0xf/0x20 default_idle_call+0x73/0x250 do_idle+0x1f5/0x2d0 cpu_startup_entry+0x1d/0x20 start_secondary+0x11f/0x160 secondary_startup_64_no_verify+0xb0/0xbb Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) CR2: 0000000000000070 ---[ end trace 0735407a540147e1 ]--- RIP: 0010:_vortex_interrupt+0x323/0x670 Code: 84 d4 00 00 00 e8 bd e9 60 fe 48 8b 45 d8 48 83 c0 0c 48 89 c6 bf 00 10 00 00 e8 98 d0 f0 fe 48 8b 45 d0 48 8b 80 d8 01 00 00 <8b> 40 70 83 c0 03 89 c0 83 e0 fc 48 89 c2 48 8b 45 d0 48 8b b0 e0 RSP: 0018:ffffc900001a4dd0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888115da0580 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81bf710e RDI: 0000000000001000 RBP: ffffc900001a4e30 R08: ffff8881008edbc0 R09: 00000000fffffffe R10: 0000000000000001 R11: 00000000a5c81234 R12: ffff8881049530a8 R13: 0000000000000000 R14: ffffffff87313288 R15: ffff888108c92000 FS: 0000000000000000(0000) GS:ffff88817b200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000070 CR3: 00000001198c2000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Kernel panic - not syncing: Fatal exception in interrupt Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 1 seconds.. Signed-off-by: Zheyu Ma --- drivers/net/ethernet/3com/3c59x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/3com/3c59x.c b/drivers/net/ethernet/3com/3c59x.c index 741c67e546d4..e27901ded7a0 100644 --- a/drivers/net/ethernet/3com/3c59x.c +++ b/drivers/net/ethernet/3com/3c59x.c @@ -2300,7 +2300,7 @@ _vortex_interrupt(int irq, struct net_device *dev) } if (status & DMADone) { - if (ioread16(ioaddr + Wn7_MasterStatus) & 0x1000) { + if ((ioread16(ioaddr + Wn7_MasterStatus) & 0x1000) && vp->tx_skb_dma) { iowrite16(0x1000, ioaddr + Wn7_MasterStatus); /* Ack the event. */ dma_unmap_single(vp->gendev, vp->tx_skb_dma, (vp->tx_skb->len + 3) & ~3, DMA_TO_DEVICE); pkts_compl++; -- 2.17.6