From a3b5f37553d569a5abd9ebcde05ea4c45cc52f50 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Tue, 12 Nov 2019 18:15:44 +0000
Subject: [PATCH] options: Fix segfault when multiple --key parameters given.

Easily reproducible using:

  $ guestfish --key dev1:key:key1 --key dev2:key:key2

causing this stack trace (or others depending on where the memory
corruption was caught):

  Program received signal SIGABRT, Aborted.
  0x00007ffff7905625 in raise () from /lib64/libc.so.6
  (gdb) bt
  #0  0x00007ffff7905625 in raise () from /lib64/libc.so.6
  #1  0x00007ffff78ee8d9 in abort () from /lib64/libc.so.6
  #2  0x00007ffff79494af in __libc_message () from /lib64/libc.so.6
  #3  0x00007ffff7950a6c in malloc_printerr () from /lib64/libc.so.6
  #4  0x00007ffff79528d0 in _int_free () from /lib64/libc.so.6
  #5  0x00005555555bdd6e in free_key_store ()
  #6  0x0000555555589027 in main ()
  (gdb) quit

(cherry picked from commit 8c42f772614b44a8cb974afa904ec9f518431ab2
in libguestfs-common)
---
 common/options/keys.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/common/options/keys.c b/common/options/keys.c
index 7f689866b..f783066ff 100644
--- a/common/options/keys.c
+++ b/common/options/keys.c
@@ -216,7 +216,8 @@ key_store_import_key (struct key_store *ks, const struct key_store_key *key)
   }
   assert (ks != NULL);
 
-  new_keys = realloc (ks->keys, sizeof (*ks->keys) + 1);
+  new_keys = realloc (ks->keys,
+                      (ks->nr_keys + 1) * sizeof (struct key_store_key));
   if (!new_keys)
     error (EXIT_FAILURE, errno, "realloc");
 
-- 
2.21.0