CVE-2022-49238 — ath11k: free peer for station when disconnect from AP for QCA6390/WCN6855

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

ath11k: free peer for station when disconnect from AP for QCA6390/WCN6855

Commit b4a0f54156ac ("ath11k: move peer delete after vdev stop of station for QCA6390 and WCN6855") is to fix firmware crash by changing the WMI command sequence, but actually skip all the peer delete operation, then it lead commit 58595c9874c6 ("ath11k: Fixing dangling pointer issue upon peer delete failure") not take effect, and then happened a use-after-free warning from KASAN. because the peer->sta is not set to NULL and then used later.

Change to only skip the WMI_PEER_DELETE_CMDID for QCA6390/WCN6855.

log of user-after-free:

[ 534.888665] BUG: KASAN: use-after-free in ath11k_dp_rx_update_peer_stats+0x912/0xc10 [ath11k] [ 534.888696] Read of size 8 at addr ffff8881396bb1b8 by task rtcwake/2860

[ 534.888705] CPU: 4 PID: 2860 Comm: rtcwake Kdump: loaded Tainted: G W 5.15.0-wt-ath+ #523 [ 534.888712] Hardware name: Intel(R) Client Systems NUC8i7HVK/NUC8i7HVB, BIOS HNKBLi70.86A.0067.2021.0528.1339 05/28/2021 [ 534.888716] Call Trace: [ 534.888720] <IRQ> [ 534.888726] dump_stack_lvl+0x57/0x7d [ 534.888736] print_address_description.constprop.0+0x1f/0x170 [ 534.888745] ? ath11k_dp_rx_update_peer_stats+0x912/0xc10 [ath11k] [ 534.888771] kasan_report.cold+0x83/0xdf [ 534.888783] ? ath11k_dp_rx_update_peer_stats+0x912/0xc10 [ath11k] [ 534.888810] ath11k_dp_rx_update_peer_stats+0x912/0xc10 [ath11k] […

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CVE-2022-49238 — ath11k: free peer for station when disconnect from AP for QCA6390/WCN6855