Re: [PATCH v3] wifi: ath12k: Fix for out-of bound access error

[Jeff Johnson]

On 11/5/2024 2:11 AM, Karol Przybylski wrote:
> Selfgen stats are placed in a buffer using print_array_to_buf_index() function.
> Array length parameter passed to the function is too big, resulting in possible
> out-of bound memory error.
> Decreasing buffer size by one fixes faulty upper bound of passed array.
> 
> Discovered in coverity scan, CID 1600742 and CID 1600758
> 
> Signed-off-by: Karol Przybylski <karprzy7@xxxxxxxxx>
> ---
> Changes in v3:
> - Code style: added spaces before and after '-'
> - Improved commit msg
> - Fixed same error in different function
> - Link to previous discussion: https://lore.kernel.org/all/08767ff7-f764-473d-a44b-c3c3b1695008@xxxxxxxxxxx/
> ---
>  drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c b/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c
> index 799b865b89e5..2d47aca681f4 100644
> --- a/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c
> +++ b/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c
> @@ -1562,7 +1562,7 @@ ath12k_htt_print_tx_selfgen_ac_stats_tlv(const void *tag_buf, u16 tag_len,
>  			 le32_to_cpu(htt_stats_buf->ac_mu_mimo_ndp));
>  	len += print_array_to_buf_index(buf, len, "ac_mu_mimo_brpollX_tried = ", 1,
>  					htt_stats_buf->ac_mu_mimo_brpoll,
> -					ATH12K_HTT_TX_NUM_AC_MUMIMO_USER_STATS, "\n\n");
> +					ATH12K_HTT_TX_NUM_AC_MUMIMO_USER_STATS - 1, "\n\n");

Our ath12k-check tool reports:
drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c:1565: line length of 92
exceeds 90 columns

I'll fix this in the 'pending' branch

>  
>  	stats_req->buf_len = len;
>  }
> @@ -1590,7 +1590,7 @@ ath12k_htt_print_tx_selfgen_ax_stats_tlv(const void *tag_buf, u16 tag_len,
>  			 le32_to_cpu(htt_stats_buf->ax_mu_mimo_ndp));
>  	len += print_array_to_buf_index(buf, len, "ax_mu_mimo_brpollX_tried = ", 1,
>  					htt_stats_buf->ax_mu_mimo_brpoll,
> -					ATH12K_HTT_TX_NUM_AX_MUMIMO_USER_STATS, "\n");
> +					ATH12K_HTT_TX_NUM_AX_MUMIMO_USER_STATS - 1, "\n");
>  	len += scnprintf(buf + len, buf_len - len, "ax_basic_trigger = %u\n",
>  			 le32_to_cpu(htt_stats_buf->ax_basic_trigger));
>  	len += scnprintf(buf + len, buf_len - len, "ax_ulmumimo_total_trigger = %u\n",