linux-kernel - [PATCH AUTOSEL 4.19 028/205] wil6210: fix invalid memory access for rx_buff

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Message-Id: <20191108113752.12502-28-sashal@kernel.org>
Date:   Fri,  8 Nov 2019 06:34:55 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dedy Lansky <dlansky@...eaurora.org>,
        Maya Erez <merez@...eaurora.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-wireless@...r.kernel.org, wil6210@....qualcomm.com,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 028/205] wil6210: fix invalid memory access for rx_buff_mgmt debugfs

From: Dedy Lansky <dlansky@...eaurora.org>

[ Upstream commit 4405b632e3da839defec966e4b0be44d0c5e3102 ]

Check rx_buff_mgmt is allocated before accessing its internal fields.

Signed-off-by: Dedy Lansky <dlansky@...eaurora.org>
Signed-off-by: Maya Erez <merez@...eaurora.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/wil6210/debugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index 51c3330bc316f..ceace95b1595c 100644
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -1263,6 +1263,9 @@ static int wil_rx_buff_mgmt_debugfs_show(struct seq_file *s, void *data)
 	int num_active;
 	int num_free;
 
+	if (!rbm->buff_arr)
+		return -EINVAL;
+
 	seq_printf(s, "  size = %zu\n", rbm->size);
 	seq_printf(s, "  free_list_empty_cnt = %lu\n",
 		   rbm->free_list_empty_cnt);
-- 
2.20.1