Fix potential crash when importing dives

If the last of the preexisting dives gets merged with a new dive we end up
dereferencing a freed pointer.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/main.c b/main.c
index d66972cdc..3d9b43b41 100644
--- a/main.c
+++ b/main.c
@@ -125,6 +125,9 @@ void report_dives(gboolean is_imported)
 		if (!merged)
 			continue;
 
+		/* careful - we might free the dive that last points to. Oops... */
+		if (last == prev || last == dive)
+			last = merged;
 		free(prev);
 		free(dive);
 		*pp = merged;