From: Jeff King <p...@peff.net>

The config handler for user.signingkey does not check for a
boolean value, and thus:

  git -c user.signingkey tag

will segfault. We could fix this and even shorten the code
by using git_config_string(). But our set_signing_key()
helper is used by other code outside of gpg-interface.c, so
we must keep it (and we may as well use it, because unlike
git_config_string() it does not leak when we overwrite an
old value).

Ironically, the handler for gpg.program just below _could_
use git_config_string() but doesn't. But since we're going
to touch that in a future patch, we'll leave it alone for
now. We will add some whitespace and returns in preparation
for adding more config keys, though.

Signed-off-by: Jeff King <p...@peff.net>
Signed-off-by: Ben Toews <mastahy...@gmail.com>
---
 gpg-interface.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gpg-interface.c b/gpg-interface.c
index 4feacf16e5..61c0690e12 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -128,13 +128,19 @@ void set_signing_key(const char *key)
 int git_gpg_config(const char *var, const char *value, void *cb)
 {
        if (!strcmp(var, "user.signingkey")) {
+               if (!value)
+                       return config_error_nonbool(var);
                set_signing_key(value);
+               return 0;
        }
+
        if (!strcmp(var, "gpg.program")) {
                if (!value)
                        return config_error_nonbool(var);
                gpg_program = xstrdup(value);
+               return 0;
        }
+
        return 0;
 }

--
2.15.1 (Apple Git-101)

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