Fixes use-after-free issue.

Calling writer() might fail in which case launch_buff gets freed.
This patch prevents the subsequent use of memory after it was freed.

1 files changed, 6 insertions, 0 deletions

diff --git a/mimedb.cpp b/mimedb.cpp
index 0a4106b2..bbc29227 100644
--- a/mimedb.cpp
+++ b/mimedb.cpp
@@ -1190,6 +1190,12 @@ static void launch(char *filter, const string_list_t &files, size_t fileno)
             writer('&');
             writer('\0');
 
+            /*
+              Calling writer might fail in which case launch_buff gets freed.
+            */
+            if (error)
+                return;
+
             if (system(launch_buff) == -1)
             {
                 fprintf(stderr, _(ERROR_SYSTEM), MIMEDB, launch_buff);