From e957e60d5c599e8655d87cb7210392928566ac11 Mon Sep 17 00:00:00 2001
From: Arjen Stolk <arjen@rngd.co>
Date: Wed, 28 Dec 2016 11:05:50 +0100
Subject: [PATCH] mailcap: prevent segfault on test entry with %s

When a mailcap entry with a testcommand containing %s is encountered, it is ignored. The
entry was freed, but not set to NULL, leading to a segfault later on.
---
 src/mime/backend/mailcap.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mime/backend/mailcap.c b/src/mime/backend/mailcap.c
index 5abe9416..4e7a9224 100644
--- a/src/mime/backend/mailcap.c
+++ b/src/mime/backend/mailcap.c
@@ -301,6 +301,7 @@ parse_optional_fields(struct mailcap_entry *entry, unsigned char *line)
 			for (field = entry->testcommand; *field; field++)
 				if (*field == '%' && *(field+1) == 's') {
 					mem_free(entry->testcommand);
+					entry->testcommand = NULL;
 					return 0;
 				}