lib-index: Make sure buffer is not null before freeing

Fixes signal 11 crash under stress.

diff --git a/src/lib-index/mail-transaction-log-file.c b/src/lib-index/mail-transaction-log-file.c
index a5da3966fbba00238e0b509235798d102c7a246c..5cc9f6020855e67275dfe18eab38f0fe772c90b3 100644 (file)
--- a/src/lib-index/mail-transaction-log-file.c
+++ b/src/lib-index/mail-transaction-log-file.c
@@ -950,7 +950,8 @@ int mail_transaction_log_file_open(struct mail_transaction_log_file *file,
                }
 
                /* ESTALE - try again */
-               buffer_free(&file->buffer);
+               if (file->buffer != NULL)
+                       buffer_free(&file->buffer);
         }
 
        mail_transaction_log_file_add_to_list(file);