[PATCH 5.3 082/180] wil6210: check len before memcpy() calls

[Greg Kroah-Hartman]

From: Denis Efremov <efremov@xxxxxxxxx>

commit 2c840676be8ffc624bf9bb4490d944fd13c02d71 upstream.

memcpy() in wmi_set_ie() and wmi_update_ft_ies() is called with
src == NULL and len == 0. This is an undefined behavior. Fix it
by checking "ie_len > 0" before the memcpy() calls.

As suggested by GCC documentation:
"The pointers passed to memmove (and similar functions in <string.h>)
must be non-null even when nbytes==0, so GCC can use that information
to remove the check after the memmove call." [1]

[1] https://gcc.gnu.org/gcc-4.9/porting_to.html

Cc: Maya Erez <merez@xxxxxxxxxxxxxx>
Cc: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Denis Efremov <efremov@xxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/net/wireless/ath/wil6210/wmi.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/ath/wil6210/wmi.c
+++ b/drivers/net/wireless/ath/wil6210/wmi.c
@@ -2478,7 +2478,8 @@ int wmi_set_ie(struct wil6210_vif *vif,
 	cmd->mgmt_frm_type = type;
 	/* BUG: FW API define ieLen as u8. Will fix FW */
 	cmd->ie_len = cpu_to_le16(ie_len);
-	memcpy(cmd->ie_info, ie, ie_len);
+	if (ie_len)
+		memcpy(cmd->ie_info, ie, ie_len);
 	rc = wmi_send(wil, WMI_SET_APPIE_CMDID, vif->mid, cmd, len);
 	kfree(cmd);
 out:
@@ -2514,7 +2515,8 @@ int wmi_update_ft_ies(struct wil6210_vif
 	}
 
 	cmd->ie_len = cpu_to_le16(ie_len);
-	memcpy(cmd->ie_info, ie, ie_len);
+	if (ie_len)
+		memcpy(cmd->ie_info, ie, ie_len);
 	rc = wmi_send(wil, WMI_UPDATE_FT_IES_CMDID, vif->mid, cmd, len);
 	kfree(cmd);