Re: [PATCH v2 0/5] wifi: ath: avoid IDR mutation while iterating

[Baochen Qiang]

On 10/3/2026 5:20 PM, Jiale Yao wrote:
> The ath10k, ath11k, and ath12k cleanup paths walk an IDR while removing
> the current entry. idr_for_each() retains radix-tree iterator state across
> the callback, so that removal can invalidate the walk.
> 
> Use idr_for_each_entry() in each cleanup path. It performs a fresh
> idr_get_next() lookup for every iteration, allowing the current entry to
> be removed safely before its skb is released. Keeping the existing locked
> removal helpers also ensures that a concurrent TX completion cannot find
> an IDR entry which points to an already freed skb.
> 
> Changes in v2:
> - Rework the ath11k and ath12k pending management TX cleanup patches to
>   remove each IDR entry before freeing its skb, as pointed out by
>   Rameshkumar and Jeff.
> - Use idr_for_each_entry() for the pending cleanup callers instead of
>   leaving freed skb pointers in the IDR until idr_destroy().
> 
> Jiale Yao (5):
>   wifi: ath10k: avoid IDR mutation during TX cleanup
>   wifi: ath11k: avoid IDR mutation during pending mgmt TX cleanup
>   wifi: ath11k: avoid IDR mutation during vif mgmt TX cleanup
>   wifi: ath12k: avoid IDR mutation during pending mgmt TX cleanup
>   wifi: ath12k: avoid IDR mutation during vif mgmt TX cleanup
> 
>  drivers/net/wireless/ath/ath10k/htt_tx.c |  7 ++++-
>  drivers/net/wireless/ath/ath11k/core.c   |  3 +--
>  drivers/net/wireless/ath/ath11k/mac.c    | 33 ++++++++++++------------
>  drivers/net/wireless/ath/ath11k/mac.h    |  2 +-
>  drivers/net/wireless/ath/ath12k/core.c   |  3 +--
>  drivers/net/wireless/ath/ath12k/mac.c    | 33 ++++++++++++------------
>  drivers/net/wireless/ath/ath12k/mac.h    |  2 +-
>  7 files changed, 44 insertions(+), 39 deletions(-)
> 

if you want to go with current state, leaving the UAF risk in patches 2/5 and 3/5 in a
separate future fix:

Reviewed-by: Baochen Qiang <baochen.qiang@xxxxxxxxxxxxxxxx>