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

Fixes signal 11 crash under stress.
dovecot · Dec 20, 2016 · eb0308e · eb0308e
1 parent 88f7ecd
commit eb0308e
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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);