wil6210: fix invalid memory access for rx_buff_mgmt debugfs

[ Upstream commit 4405b632e3da839defec966e4b0be44d0c5e3102 ]

Check rx_buff_mgmt is allocated before accessing its internal fields.

Signed-off-by: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index 51c3330..ceace95 100644 (file)
--- 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);