1 files changed, 15 insertions, 3 deletions

diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index ef4d0c9f6578..1aab0a32870c 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -129,12 +129,24 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
         /* 1.The device has its own operation to switch source of clock */
         if (clk_spec) {
                 err = clk_spec->get(bebob, &id);
-                if (err < 0)
+                if (err < 0) {
                         dev_err(&bebob->unit->device,
                                 "fail to get clock source: %d\n", err);
-                else if (strncmp(clk_spec->labels[id], SND_BEBOB_CLOCK_INTERNAL,
-                                 strlen(SND_BEBOB_CLOCK_INTERNAL)) == 0)
+                        goto end;
+                }
+
+                if (id >= clk_spec->num) {
+                        dev_err(&bebob->unit->device,
+                                "clock source %d out of range 0..%d\n",
+                                id, clk_spec->num - 1);
+                        err = -EIO;
+                        goto end;
+                }
+
+                if (strncmp(clk_spec->labels[id], SND_BEBOB_CLOCK_INTERNAL,
+                            strlen(SND_BEBOB_CLOCK_INTERNAL)) == 0)
                         *internal = true;
+
                 goto end;
         }