Search Linux Wireless

Re: [PATCH v2 1/4] ath11k: Fix double free issue during SRNG deinit

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 8/25/2022 4:18 AM, Manikanta Pubbisetty wrote:
Currently struct ath11k_hal::srng_config pointer is not assigned
to NULL after freeing the memory in ath11k_hal_srng_deinit().
This could lead to double free issue in a scerario where

nit: s/scerario/scenario/

ath11k_hal_srng_deinit() is invoked back to back.

In the current code, although the chances are very low, the above
said scenario could happen when hardware recovery has failed and
then there is another FW assert where ath11k_hal_srng_deinit() is
invoked once again as part of recovery. Addressing this issue is
important when low power mode support is enabled in the driver
(will be added by a future patch) where this scenario is likely.

Fix this by assigning the struct ath11k_hal::srng_config pointer
to NULL after freeing the memory.

Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00887-QCAMSLSWPLZ-1

Signed-off-by: Manikanta Pubbisetty <quic_mpubbise@xxxxxxxxxxx>
---
  drivers/net/wireless/ath/ath11k/hal.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath11k/hal.c b/drivers/net/wireless/ath/ath11k/hal.c
index bda71ab5a1f2..ebdf3b1a6661 100644
--- a/drivers/net/wireless/ath/ath11k/hal.c
+++ b/drivers/net/wireless/ath/ath11k/hal.c
@@ -1319,6 +1319,7 @@ void ath11k_hal_srng_deinit(struct ath11k_base *ab)
  	ath11k_hal_free_cont_rdp(ab);
  	ath11k_hal_free_cont_wrp(ab);
  	kfree(hal->srng_config);
+	hal->srng_config = NULL;
  }
  EXPORT_SYMBOL(ath11k_hal_srng_deinit);




[Index of Archives]     [Linux Host AP]     [ATH6KL]     [Linux Wireless Personal Area Network]     [Linux Bluetooth]     [Wireless Regulations]     [Linux Netdev]     [Kernel Newbies]     [Linux Kernel]     [IDE]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite Hiking]     [MIPS Linux]     [ARM Linux]     [Linux RAID]

  Powered by Linux