| Message ID | 1520232242-24132-1-git-send-email-cjhuang@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
+ Felix, who had feedback on the last version On Mon, Mar 05, 2018 at 02:44:02PM +0800, Carl Huang wrote: > 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> > --- > drivers/net/wireless/ath/ath10k/trace.h | 12 ++++-------- > drivers/net/wireless/ath/ath10k/wmi.c | 2 +- > 2 files changed, 5 insertions(+), 9 deletions(-) > > diff --git a/drivers/net/wireless/ath/ath10k/trace.h b/drivers/net/wireless/ath/ath10k/trace.h > index e40edce..7d2fac3 100644 > --- 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 > ) > ); > > diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c > index 58dc218..fc9f50d 100644 > --- a/drivers/net/wireless/ath/ath10k/wmi.c > +++ b/drivers/net/wireless/ath/ath10k/wmi.c > @@ -1742,8 +1742,8 @@ int ath10k_wmi_cmd_send_nowait(struct ath10k *ar, struct sk_buff *skb, > 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; Tested-by: Brian Norris <briannorris@chromium.org> Reviewed-by: Brian Norris <briannorris@chromium.org>
Carl Huang <cjhuang@codeaurora.org> wrote: > 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> Patch applied to ath-next branch of ath.git, thanks. 9ef0f58ed7b4 ath10k: fix use-after-free in ath10k_wmi_cmd_send_nowait
diff --git a/drivers/net/wireless/ath/ath10k/trace.h b/drivers/net/wireless/ath/ath10k/trace.h index e40edce..7d2fac3 100644 --- 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 ) ); diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c index 58dc218..fc9f50d 100644 --- a/drivers/net/wireless/ath/ath10k/wmi.c +++ b/drivers/net/wireless/ath/ath10k/wmi.c @@ -1742,8 +1742,8 @@ int ath10k_wmi_cmd_send_nowait(struct ath10k *ar, struct sk_buff *skb, 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;
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> --- drivers/net/wireless/ath/ath10k/trace.h | 12 ++++-------- drivers/net/wireless/ath/ath10k/wmi.c | 2 +- 2 files changed, 5 insertions(+), 9 deletions(-)