[ath-current] wifi: ath11k: fix NULL pointer dereference in ath11k_hal_srng_access_begin

[Gaole Zhang]

In ATH11K_QMI_EVENT_FW_READY, ATH11K_FLAG_REGISTERED is set
unconditionally even when ath11k_core_qmi_firmware_ready() fails.
This leaves the driver in an inconsistent state where
initialization is considered complete although the firmware ready
handling did not finish successfully. During the subsequent SSR,
the driver enters the restart path based on this incorrect state
and dereferences uninitialized srng members, resulting in a NULL
pointer dereference.

Call trace:
  ath11k_hal_srng_access_begin+0xc/0x60 [ath11k] (P)
  ath11k_ce_cleanup_pipes+0x17c/0x180 [ath11k]
  ath11k_core_restart+0x40/0x168 [ath11k]

Fix this by:
- skipping firmware_ready if ATH11K_FLAG_REGISTERED is already set
- setting ATH11K_FLAG_REGISTERED only when firmware_ready succeeds
- setting ATH11K_FLAG_QMI_FAIL and aborting the FW_READY handling
on error

Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.2.0.c2-00204-QCAMSLSWPLZ-1

Fixes: 6fe62a8cec51c ("wifi: ath11k: Add cold boot calibration support on WCN6750")
Signed-off-by: Gaole Zhang <gaole.zhang at oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath11k/qmi.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/qmi.c b/drivers/net/wireless/ath/ath11k/qmi.c
index feebbc30f3df..a304feca7042 100644
--- a/drivers/net/wireless/ath/ath11k/qmi.c
+++ b/drivers/net/wireless/ath/ath11k/qmi.c
@@ -3295,9 +3295,14 @@ static void ath11k_qmi_driver_event_work(struct work_struct *work)
 			clear_bit(ATH11K_FLAG_CRASH_FLUSH,
 				  &ab->dev_flags);
 			clear_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags);
-			ath11k_core_qmi_firmware_ready(ab);
-			set_bit(ATH11K_FLAG_REGISTERED, &ab->dev_flags);
-
+			if (!test_bit(ATH11K_FLAG_REGISTERED, &ab->dev_flags)) {
+				ret = ath11k_core_qmi_firmware_ready(ab);
+				if (ret) {
+					set_bit(ATH11K_FLAG_QMI_FAIL, &ab->dev_flags);
+					break;
+				}
+				set_bit(ATH11K_FLAG_REGISTERED, &ab->dev_flags);
+			}
 			break;
 		case ATH11K_QMI_EVENT_COLD_BOOT_CAL_DONE:
 			break;

base-commit: dc14686f27df6454b13b16ad1c9203ab3e9b0375
-- 
2.34.1