scsi/gdth: fix crash in gdth_timeout if no gdth controllers found

If the gdth module is loaded (or compiled in), the gdth_timeout function
gets started even if no actual gdth controllers are found b the probing.

That ends up not only being unnecessary, but also causes a crash due to
the function blindly just trying to pick the first entry off the
"gdth_instances" list, and accessing it - which obviously doesn't work
if the list is empty!

Noticed by Ingo Molnar.

Tested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index e8010a702e73..3ac080ee6e2f 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -5213,6 +5213,10 @@ static int __init gdth_init(void)
 #endif /* CONFIG_PCI */
 
         TRACE2(("gdth_detect() %d controller detected\n", gdth_ctr_count));
+
+        if (list_empty(&gdth_instances))
+                return -ENODEV;
+
 #ifdef GDTH_STATISTICS
         TRACE2(("gdth_detect(): Initializing timer !\n"));
         init_timer(&gdth_timer);