setup: dynamically set size of iwad_labels array

With the addition of the Freedoom IWADs, the number of IWADs supported
by chocolate-doom has been raised to 10. However, the iwad_labels[]
array only holds place for up to 8 pointers. Incidently, I have all 10
IWADs installed and trying to warp into a game from
chocolate-doom-setup leads to an out-of-bounds access of this array
and so the application crashes with a segmentation fault.

Instead of increasing the array size to 10, which will bite us next
time, I decided to set its size dynamically as soon as the number of
IWADs of known.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/setup/multiplayer.c b/src/setup/multiplayer.c
index f116ffb2..8c8fe0c5 100644
--- a/src/setup/multiplayer.c
+++ b/src/setup/multiplayer.c
@@ -55,7 +55,7 @@ static const iwad_t fallback_iwads[] = {
 // Array of IWADs found to be installed
 
 static const iwad_t **found_iwads;
-static char *iwad_labels[8];
+static char **iwad_labels;
 
 // Index of the currently selected IWAD
 
@@ -559,10 +559,16 @@ static txt_widget_t *IWADSelector(void)
 
     for (i=0; found_iwads[i] != NULL; ++i)
     {
-        iwad_labels[i] = found_iwads[i]->description;
          ++num_iwads;
     }
 
+    iwad_labels = malloc(sizeof(*iwad_labels) * num_iwads);
+
+    for (i=0; i < num_iwads; ++i)
+    {
+        iwad_labels[i] = found_iwads[i]->description;
+    }
+
     // If no IWADs are found, provide Doom 2 as an option, but
     // we're probably screwed.