4.4-stable review patch. If anyone has any objections, please let me know.
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From: Carl Huang cjhuang@codeaurora.org
commit 9ef0f58ed7b4a55da4a64641d538e0d9e46579ac upstream.
The skb may be freed in tx completion context before trace_ath10k_wmi_cmd is called. This can be easily captured when KASAN(Kernel Address Sanitizer) is enabled. The fix is to move trace_ath10k_wmi_cmd before the send operation. As the ret has no meaning in trace_ath10k_wmi_cmd then, so remove this parameter too.
Signed-off-by: Carl Huang cjhuang@codeaurora.org Tested-by: Brian Norris briannorris@chromium.org Reviewed-by: Brian Norris briannorris@chromium.org Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Amit Pundir amit.pundir@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/wireless/ath/ath10k/trace.h | 12 ++++-------- drivers/net/wireless/ath/ath10k/wmi.c | 2 +- 2 files changed, 5 insertions(+), 9 deletions(-)
--- a/drivers/net/wireless/ath/ath10k/trace.h +++ b/drivers/net/wireless/ath/ath10k/trace.h @@ -152,10 +152,9 @@ TRACE_EVENT(ath10k_log_dbg_dump, );
TRACE_EVENT(ath10k_wmi_cmd, - TP_PROTO(struct ath10k *ar, int id, const void *buf, size_t buf_len, - int ret), + TP_PROTO(struct ath10k *ar, int id, const void *buf, size_t buf_len),
- TP_ARGS(ar, id, buf, buf_len, ret), + TP_ARGS(ar, id, buf, buf_len),
TP_STRUCT__entry( __string(device, dev_name(ar->dev)) @@ -163,7 +162,6 @@ TRACE_EVENT(ath10k_wmi_cmd, __field(unsigned int, id) __field(size_t, buf_len) __dynamic_array(u8, buf, buf_len) - __field(int, ret) ),
TP_fast_assign( @@ -171,17 +169,15 @@ TRACE_EVENT(ath10k_wmi_cmd, __assign_str(driver, dev_driver_string(ar->dev)); __entry->id = id; __entry->buf_len = buf_len; - __entry->ret = ret; memcpy(__get_dynamic_array(buf), buf, buf_len); ),
TP_printk( - "%s %s id %d len %zu ret %d", + "%s %s id %d len %zu", __get_str(driver), __get_str(device), __entry->id, - __entry->buf_len, - __entry->ret + __entry->buf_len ) );
--- a/drivers/net/wireless/ath/ath10k/wmi.c +++ b/drivers/net/wireless/ath/ath10k/wmi.c @@ -1642,8 +1642,8 @@ int ath10k_wmi_cmd_send_nowait(struct at cmd_hdr->cmd_id = __cpu_to_le32(cmd);
memset(skb_cb, 0, sizeof(*skb_cb)); + trace_ath10k_wmi_cmd(ar, cmd_id, skb->data, skb->len); ret = ath10k_htc_send(&ar->htc, ar->wmi.eid, skb); - trace_ath10k_wmi_cmd(ar, cmd_id, skb->data, skb->len, ret);
if (ret) goto err_pull;