[PATCH 1/2] wifi: ath12k: fix crash when unbinding
From: Jose Ignacio Tornos Martinez
Date: Thu Oct 10 2024 - 13:55:47 EST
If there is an error during some initialization realated to firmware,
the funcion ath12k_dp_cc_cleanup is already call to release resources.
However this is released again when the device is unbinded (ath12k_pci),
and we get:
[ 382.050650] BUG: kernel NULL pointer dereference, address: 0000000000000020
[ 382.050656] #PF: supervisor read access in kernel mode
[ 382.050657] #PF: error_code(0x0000) - not-present page
[ 382.050659] PGD 0 P4D 0
[ 382.050661] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 382.050664] CPU: 0 UID: 0 PID: 6541 Comm: bash Kdump: loaded Not tainted 6.12.0-rc1+ #14
[ 382.050666] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014
[ 382.050667] RIP: 0010:ath12k_dp_cc_cleanup.part.0+0xb6/0x500 [ath12k]
[ 382.050688] Code: 8b 76 28 48 8b 7b 10 45 31 c0 b9 02 00 00 00 e8 30 3d 35 c2 be 02 00 00 00 4c 89 f7 e8 e3 00 fb c2 49 83 c7 28 49 39 ef 74 31 <41> f6 47 20 01 75 ab 4c 89 ff e8 2b de a2 c2 84 c0 74 0e 49 8b 17
[ 382.050689] RSP: 0018:ffffa3e3c0e83990 EFLAGS: 00010297
[ 382.050691] RAX: 0000000000000000 RBX: ffff90de08750000 RCX: 0000000000000000
[ 382.050692] RDX: 0000000000000001 RSI: ffff90de08751178 RDI: ffff90de08751970
[ 382.050693] RBP: 0000000000005000 R08: 0000000000000200 R09: 000000000040003f
[ 382.050694] R10: 000000000040003f R11: 0000000000000000 R12: dead000000000122
[ 382.050695] R13: dead000000000100 R14: ffffffffc0b6f948 R15: 0000000000000000
[ 382.050696] FS: 00007f216b1ab740(0000) GS:ffff90de5fc00000(0000) knlGS:0000000000000000
[ 382.050698] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 382.050699] CR2: 0000000000000020 CR3: 000000001a26c000 CR4: 0000000000752ef0
[ 382.050702] PKRU: 55555554
[ 382.050703] Call Trace:
[ 382.050705] <TASK>
[ 382.050707] ? __die_body.cold+0x19/0x27
[ 382.050719] ? page_fault_oops+0x15a/0x2f0
[ 382.050723] ? exc_page_fault+0x7e/0x180
[ 382.050724] ? asm_exc_page_fault+0x26/0x30
[ 382.050729] ? ath12k_dp_cc_cleanup.part.0+0xb6/0x500 [ath12k]
[ 382.050740] ? delay_halt_tpause+0x1a/0x20
[ 382.050742] ath12k_dp_free+0x67/0x110 [ath12k]
[ 382.050753] ath12k_core_deinit+0x8d/0xb0 [ath12k]
[ 382.050762] ath12k_pci_remove+0x50/0xf0 [ath12k]
[ 382.050771] pci_device_remove+0x3f/0xb0
[ 382.050773] device_release_driver_internal+0x19c/0x200
[ 382.050777] unbind_store+0xa1/0xb0
...
The issue is always reproducible from a VM because the MSI addressing
initialization is failing.
In order to fix the issue, just set to NULL the relaeased structure in
ath12k_dp_cc_cleanup at the end.
cc: stable@xxxxxxxxxxxxxxx
Fixes: d889913205cf7 ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@xxxxxxxxxx>
---
drivers/net/wireless/ath/ath12k/dp.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/wireless/ath/ath12k/dp.c b/drivers/net/wireless/ath/ath12k/dp.c
index 61aa78d8bd8c..789d430e4455 100644
--- a/drivers/net/wireless/ath/ath12k/dp.c
+++ b/drivers/net/wireless/ath/ath12k/dp.c
@@ -1241,6 +1241,7 @@ static void ath12k_dp_cc_cleanup(struct ath12k_base *ab)
}
kfree(dp->spt_info);
+ dp->spt_info = NULL;
}
static void ath12k_dp_reoq_lut_cleanup(struct ath12k_base *ab)
--
2.46.2