Alexander Coffin <alex.coffin@xxxxxxxxxxxx> wrote: > > ret = brcmf_proto_tx_queue_data(drvr, ifp->ifidx, skb); > > may be schedule, and then complete before the line > > > ndev->stats.tx_bytes += skb->len; > > [ 46.912801] ================================================================== > [ 46.920552] BUG: KASAN: use-after-free in brcmf_netdev_start_xmit+0x718/0x8c8 [brcmfmac] > [ 46.928673] Read of size 4 at addr ffffff803f5882e8 by task systemd-resolve/328 > [ 46.935991] > [ 46.937514] CPU: 1 PID: 328 Comm: systemd-resolve Tainted: G O 5.4.199-[REDACTED] #1 > [ 46.947255] Hardware name: [REDACTED] > [ 46.954568] Call trace: > [ 46.957037] dump_backtrace+0x0/0x2b8 > [ 46.960719] show_stack+0x24/0x30 > [ 46.964052] dump_stack+0x128/0x194 > [ 46.967557] print_address_description.isra.0+0x64/0x380 > [ 46.972877] __kasan_report+0x1d4/0x240 > [ 46.976723] kasan_report+0xc/0x18 > [ 46.980138] __asan_report_load4_noabort+0x18/0x20 > [ 46.985027] brcmf_netdev_start_xmit+0x718/0x8c8 [brcmfmac] > [ 46.990613] dev_hard_start_xmit+0x1bc/0xda0 > [ 46.994894] sch_direct_xmit+0x198/0xd08 > [ 46.998827] __qdisc_run+0x37c/0x1dc0 > [ 47.002500] __dev_queue_xmit+0x1528/0x21f8 > [ 47.006692] dev_queue_xmit+0x24/0x30 > [ 47.010366] neigh_resolve_output+0x37c/0x678 > [ 47.014734] ip_finish_output2+0x598/0x2458 > [ 47.018927] __ip_finish_output+0x300/0x730 > [ 47.023118] ip_output+0x2e0/0x430 > [ 47.026530] ip_local_out+0x90/0x140 > [ 47.030117] igmpv3_sendpack+0x14c/0x228 > [ 47.034049] igmpv3_send_cr+0x384/0x6b8 > [ 47.037895] igmp_ifc_timer_expire+0x4c/0x118 > [ 47.042262] call_timer_fn+0x1cc/0xbe8 > [ 47.046021] __run_timers+0x4d8/0xb28 > [ 47.049693] run_timer_softirq+0x24/0x40 > [ 47.053626] __do_softirq+0x2c0/0x117c > [ 47.057387] irq_exit+0x2dc/0x388 > [ 47.060715] __handle_domain_irq+0xb4/0x158 > [ 47.064908] gic_handle_irq+0x58/0xb0 > [ 47.068581] el0_irq_naked+0x50/0x5c > [ 47.072162] > [ 47.073665] Allocated by task 328: > [ 47.077083] save_stack+0x24/0xb0 > [ 47.080410] __kasan_kmalloc.isra.0+0xc0/0xe0 > [ 47.084776] kasan_slab_alloc+0x14/0x20 > [ 47.088622] kmem_cache_alloc+0x15c/0x468 > [ 47.092643] __alloc_skb+0xa4/0x498 > [ 47.096142] igmpv3_newpack+0x158/0xd78 > [ 47.099987] add_grhead+0x210/0x288 > [ 47.103485] add_grec+0x6b0/0xb70 > [ 47.106811] igmpv3_send_cr+0x2e0/0x6b8 > [ 47.110657] igmp_ifc_timer_expire+0x4c/0x118 > [ 47.115027] call_timer_fn+0x1cc/0xbe8 > [ 47.118785] __run_timers+0x4d8/0xb28 > [ 47.122457] run_timer_softirq+0x24/0x40 > [ 47.126389] __do_softirq+0x2c0/0x117c > [ 47.130142] > [ 47.131643] Freed by task 180: > [ 47.134712] save_stack+0x24/0xb0 > [ 47.138041] __kasan_slab_free+0x108/0x180 > [ 47.142146] kasan_slab_free+0x10/0x18 > [ 47.145904] slab_free_freelist_hook+0xa4/0x1b0 > [ 47.150444] kmem_cache_free+0x8c/0x528 > [ 47.154292] kfree_skbmem+0x94/0x108 > [ 47.157880] consume_skb+0x10c/0x5a8 > [ 47.161466] __dev_kfree_skb_any+0x88/0xa0 > [ 47.165598] brcmu_pkt_buf_free_skb+0x44/0x68 [brcmutil] > [ 47.171023] brcmf_txfinalize+0xec/0x190 [brcmfmac] > [ 47.176016] brcmf_proto_bcdc_txcomplete+0x1c0/0x210 [brcmfmac] > [ 47.182056] brcmf_sdio_sendfromq+0x8dc/0x1e80 [brcmfmac] > [ 47.187568] brcmf_sdio_dpc+0xb48/0x2108 [brcmfmac] > [ 47.192529] brcmf_sdio_dataworker+0xc8/0x238 [brcmfmac] > [ 47.197859] process_one_work+0x7fc/0x1a80 > [ 47.201965] worker_thread+0x31c/0xc40 > [ 47.205726] kthread+0x2d8/0x370 > [ 47.208967] ret_from_fork+0x10/0x18 > [ 47.212546] > [ 47.214051] The buggy address belongs to the object at ffffff803f588280 > [ 47.214051] which belongs to the cache skbuff_head_cache of size 208 > [ 47.227086] The buggy address is located 104 bytes inside of > [ 47.227086] 208-byte region [ffffff803f588280, ffffff803f588350) > [ 47.238814] The buggy address belongs to the page: > [ 47.243618] page:ffffffff00dd6200 refcount:1 mapcount:0 mapping:ffffff804b6bf800 index:0xffffff803f589900 compound_mapcount: 0 > [ 47.255007] flags: 0x10200(slab|head) > [ 47.258689] raw: 0000000000010200 ffffffff00dfa980 0000000200000002 ffffff804b6bf800 > [ 47.266439] raw: ffffff803f589900 0000000080190018 00000001ffffffff 0000000000000000 > [ 47.274180] page dumped because: kasan: bad access detected > [ 47.279752] > [ 47.281251] Memory state around the buggy address: > [ 47.286051] ffffff803f588180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > [ 47.293277] ffffff803f588200: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc > [ 47.300502] >ffffff803f588280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > [ 47.307723] ^ > [ 47.314343] ffffff803f588300: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc > [ 47.321569] ffffff803f588380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb > [ 47.328789] ================================================================== > > Signed-off-by: Alexander Coffin <alex.coffin@xxxxxxxxxxxx> Patch applied to wireless-next.git, thanks. 3f42faf6db43 wifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit() -- https://patchwork.kernel.org/project/linux-wireless/patch/20220808174925.3922558-1-alex.coffin@xxxxxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
