net/fm: call fm_port_to_index() with proper checks
Some of the fm_port_to_index() callers did not check for -1 return value and
used -1 as an array index.
Signed-off-by: Marian Rotariu <marian.rotariu@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/drivers/net/fm/fm.h b/drivers/net/fm/fm.h
index 43de114..316e06e 100644
--- a/drivers/net/fm/fm.h
+++ b/drivers/net/fm/fm.h
@@ -143,6 +143,7 @@
#define MAX_RXBUF_LOG2 11
#define MAX_RXBUF_LEN (1 << MAX_RXBUF_LOG2)
-#define PORT_IS_ENABLED(port) fm_info[fm_port_to_index(port)].enabled
+#define PORT_IS_ENABLED(port) (fm_port_to_index(port) == -1 ? \
+ 0 : fm_info[fm_port_to_index(port)].enabled)
#endif /* __FM_H__ */