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ath10k: Check tx_stats before use it

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tx_stats will be freed and set to NULL before debugfs_sta node is
removed in station disconnetion process. So if read the debugfs_sta
node there may be NULL pointer error. Add check for tx_stats before
use it to resove this issue.

Signed-off-by: Yingying Tang <yintang@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Yingying Tang 2019-05-02 21:36:50 +08:00 committed by Kalle Valo
parent 49ed34b835
commit 9e7251fa38
1 changed files with 7 additions and 0 deletions
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7
drivers/net/wireless/ath/ath10k/debugfs_sta.c
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@ -663,6 +663,13 @@ static ssize_t ath10k_dbg_sta_dump_tx_stats(struct file *file,
mutex_lock(&ar->conf_mutex);
if (!arsta->tx_stats) {
ath10k_warn(ar, "failed to get tx stats");
mutex_unlock(&ar->conf_mutex);
kfree(buf);
return 0;
}
spin_lock_bh(&ar->data_lock);
for (k = 0; k < ATH10K_STATS_TYPE_MAX; k++) {
for (j = 0; j < ATH10K_COUNTER_TYPE_MAX; j++) {