Wen Gong <wgong@xxxxxxxxxxxxxx> writes:
> On 2020-06-03 08:17, Pradeep Kumar Chitrapu wrote:
> ...
>> @@ -2126,6 +2136,68 @@ int ath11k_wmi_send_scan_start_cmd(struct
>> ath11k *ar,
>>
>> ptr += extraie_len_with_pad;
>>
>> + if (params->num_hint_s_ssid) {
>> + len = params->num_hint_s_ssid * sizeof(struct hint_short_ssid);
>> + tlv = ptr;
>> + tlv->header = FIELD_PREP(WMI_TLV_TAG, WMI_TAG_ARRAY_FIXED_STRUCT) |
>> + FIELD_PREP(WMI_TLV_LEN, len);
>> + ptr += TLV_HDR_SIZE;
>> + s_ssid = ptr;
>> + for (i = 0; i < params->num_hint_s_ssid; ++i) {
>> + s_ssid->freq_flags = params->hint_s_ssid[i].freq_flags;
>> + s_ssid->short_ssid = params->hint_s_ssid[i].short_ssid;
>> + s_ssid++;
>> + }
>> + ptr += len;
>> + }
>> +
>> + if (params->num_hint_bssid) {
>> + len = params->num_hint_bssid * sizeof(struct hint_bssid);
>> + tlv = ptr;
>> + tlv->header = FIELD_PREP(WMI_TLV_TAG, WMI_TAG_ARRAY_FIXED_STRUCT) |
>> + FIELD_PREP(WMI_TLV_LEN, len);
>> + ptr += TLV_HDR_SIZE;
>> + hint_bssid = ptr;
>> + for (i = 0; i < params->num_hint_bssid; ++i) {
>> + hint_bssid->freq_flags =
>> + params->hint_bssid[i].freq_flags;
>> + ether_addr_copy(¶ms->hint_bssid[i].bssid.addr[0],
>> + &hint_bssid->bssid.addr[0]);
>> + hint_bssid++;
>> + }
>> + }
>> +
>> + len = params->num_hint_s_ssid * sizeof(struct hint_short_ssid);
>> + tlv = ptr;
>> + tlv->header = FIELD_PREP(WMI_TLV_TAG, WMI_TAG_ARRAY_FIXED_STRUCT) |
>> + FIELD_PREP(WMI_TLV_LEN, len);
>> + ptr += TLV_HDR_SIZE;
>> + if (params->num_hint_s_ssid) {
>> + s_ssid = ptr;
>> + for (i = 0; i < params->num_hint_s_ssid; ++i) {
>> + s_ssid->freq_flags = params->hint_s_ssid[i].freq_flags;
>> + s_ssid->short_ssid = params->hint_s_ssid[i].short_ssid;
>> + s_ssid++;
>> + }
>> + }
>> + ptr += len;
>> +
>> + len = params->num_hint_bssid * sizeof(struct hint_bssid);
>> + tlv = ptr;
>> + tlv->header = FIELD_PREP(WMI_TLV_TAG, WMI_TAG_ARRAY_FIXED_STRUCT) |
>> + FIELD_PREP(WMI_TLV_LEN, len);
>> + ptr += TLV_HDR_SIZE;
>> + if (params->num_hint_bssid) {
>> + hint_bssid = ptr;
>> + for (i = 0; i < params->num_hint_bssid; ++i) {
>> + hint_bssid->freq_flags =
>> + params->hint_bssid[i].freq_flags;
>> + ether_addr_copy(¶ms->hint_bssid[i].bssid.addr[0],
>> + &hint_bssid->bssid.addr[0]);
>> + hint_bssid++;
>> + }
>> + }
>> +
> It handle num_hint_bssid/ num_hint_s_ssid twice, and lead skb overflow
> and lead crash
> Removed one then not crash by my test.
>
> [ 333.887631] ath11k_pci 0000:05:00.0: ath11k_wmi_send_scan_start_cmd
> 2 skb null 0
> ,pK:ffff921f6fd85400,llx:ffff921f6fd85400,px:ffff921f6fd85400,p:000000008d8d8abe
> [ 333.887633] ath11k_pci 0000:05:00.0: ath11k_wmi_send_scan_start_cmd
> 2 skb
> len:372,end:448,tail:448,head:ffff921f6d7a3140,data:ffff921f6d7a318c
> [ 333.887635] ath11k_pci 0000:05:00.0: ath11k_wmi_send_scan_start_cmd
> 2 shinfo nr_frags 19 null 0,pk:ffff921f6d7a3300,llx:ffff921f6d7a3300
> [ 333.887638] ath11k_pci 0000:05:00.0: ath11k_wmi_cmd_send_nowait 1
> skb null 0
> ,pK:ffff921f6fd85400,llx:ffff921f6fd85400,px:ffff921f6fd85400,p:000000008d8d8abe
> [ 333.887640] ath11k_pci 0000:05:00.0: ath11k_wmi_cmd_send_nowait 1
> skb
> len:376,end:448,tail:448,head:ffff921f6d7a3140,data:ffff921f6d7a3188
> [ 333.887642] ath11k_pci 0000:05:00.0: ath11k_wmi_cmd_send_nowait
> shinfo nr_frags 19 null 0,pk:ffff921f6d7a3300,llx:ffff921f6d7a3300
> [ 333.887644] ath11k_pci 0000:05:00.0: htc ep 2 consumed 1 credits
> (total 1)
> [ 333.887649] ath11k_pci 0000:05:00.0: ath11k_ce_send 1 write_index
> 6, skb null 0
> ,pK:ffff921f6fd85400,llx:ffff921f6fd85400,px:ffff921f6fd85400,p:000000008d8d8abe
> [ 333.887650] ath11k_pci 0000:05:00.0: ath11k_ce_send 1 skb
> len:384,end:448,tail:448,head:ffff921f6d7a3140,data:ffff921f6d7a3180
> [ 333.887652] ath11k_pci 0000:05:00.0: ath11k_ce_send shinfo nr_frags
> 19 null 0,pk:ffff921f6d7a3300,llx:ffff921f6d7a3300
> [ 333.887654] ath11k_pci 0000:05:00.0: wmi cmd send 0x3001 ret 0
> [ 333.887729] general protection fault, probably for non-canonical
> address 0x2e676e69746e756f: 0000 [#1] SMP PTI
> [ 333.887734] CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: G
> W OE 5.8.0-rc1+ #3
> [ 333.887735] Hardware name: LENOVO 418065C/418065C, BIOS 83ET63WW
> (1.33 ) 07/29/2011
> [ 333.887741] RIP: 0010:skb_release_data+0x66/0x170
> [ 333.887744] Code: 41 0f c1 44 24 20 39 c2 0f 85 ff 00 00 00 31 db
> 41 80 7c 24 02 00 48 89 fd 74 39 48 63 c3 48 83 c0 03 48 c1 e0 04 49
> 8b 3c 04 <48> 8b 47 08 48 8d 50 ff a8 01 48 0f 45 fa 66 66 66 66 90 f0
> ff 4f
> [ 333.887746] RSP: 0018:ffffb3204010ce48 EFLAGS: 00010206
> [ 333.887748] RAX: 0000000000000030 RBX: 0000000000000000 RCX:
> 000000000000466e
> [ 333.887749] RDX: 0000000000000011 RSI: 0000000000000001 RDI:
> 2e676e69746e756f
> [ 333.887751] RBP: ffff921f6fd85400 R08: ffff921f7e5dc9b8 R09:
> ffff921f7e5cb000
> [ 333.887752] R10: 000000000000000c R11: 0000000000001142 R12:
> ffff921f6d7a3300
> [ 333.887754] R13: 0000000000000013 R14: ffff921f68d41658 R15:
> ffff921f68d42e68
> [ 333.887756] FS: 0000000000000000(0000) GS:ffff921f7a240000(0000)
> knlGS:0000000000000000
> [ 333.887757] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 333.887759] CR2: 00007f73be694b58 CR3: 000000008f40a004 CR4:
> 00000000000606e0
> [ 333.887760] Call Trace:
> [ 333.887763] <IRQ>
> [ 333.887766] consume_skb+0x27/0xb0
> [ 333.887780] ath11k_ce_send_done_cb+0x2a2/0x2c0 [ath11k]
> [ 333.887789] ath11k_ce_per_engine_service+0x50/0x3b0 [ath11k]
> [ 333.887796] ? ath11k_info+0x56/0x60 [ath11k]
> [ 333.887799] ? __irq_put_desc_unlock+0x18/0x50
> [ 333.887802] ath11k_pci_ce_tasklet+0x2f/0x50 [ath11k_pci]
> [ 333.887806] tasklet_action_common.isra.21+0xee/0x110
> [ 333.887809] __do_softirq+0xfd/0x2bb
> [ 333.887814] asm_call_on_stack+0x12/0x20
> [ 333.887815] </IRQ>
> [ 333.887819] do_softirq_own_stack+0x39/0x50
> [ 333.887821] irq_exit_rcu+0x9e/0xa0
> [ 333.887825] common_interrupt+0xa4/0x140
> [ 333.887828] asm_common_interrupt+0x1e/0x40
> [ 333.887832] RIP: 0010:cpuidle_enter_state+0xc6/0x420
Pradeep, do you have a fix for this crash?
--
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