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

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Message-Id: <20241105101132.374372-1-karprzy7@gmail.com>
Date: Tue,  5 Nov 2024 11:11:31 +0100
From: Karol Przybylski <karprzy7@...il.com>
To: kvalo@...nel.org,
	jjohnson@...nel.org
Cc: Karol Przybylski <karprzy7@...il.com>,
	linux-wireless@...r.kernel.org,
	ath12k@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org
Subject: [PATCH v3] wifi: ath12k: Fix for out-of bound access error

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@...il.com>
---
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@quicinc.com/
---
 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");
 
 	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",
-- 
2.34.1