[PATCHv2 6/6] gpg-interface: provide clear helper for struct signature_check

[Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx>]

The struct has been growing members whose malloced memory needs to be
freed. Do this with one helper function so that no malloced memory shall
be left unfreed.

Signed-off-by: Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx>
---
 builtin/merge.c         |  6 +-----
 builtin/verify-commit.c |  5 +----
 gpg-interface.c         | 14 ++++++++++++++
 gpg-interface.h         |  1 +
 pretty.c                |  5 +----
 5 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/builtin/merge.c b/builtin/merge.c
index 6a9812a..e50323d 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1282,11 +1282,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 				printf(_("Commit %s has a good GPG signature by %s\n"),
 				       hex, signature_check.signer);
 
-			free(signature_check.payload);
-			free(signature_check.gpg_output);
-			free(signature_check.gpg_status);
-			free(signature_check.signer);
-			free(signature_check.key);
+			signature_check_clear(&signature_check);
 		}
 	}
 
diff --git a/builtin/verify-commit.c b/builtin/verify-commit.c
index 69b7c6d..d254fcf 100644
--- a/builtin/verify-commit.c
+++ b/builtin/verify-commit.c
@@ -32,10 +32,7 @@ static int run_gpg_verify(const unsigned char *sha1, const char *buf, unsigned l
 	if (signature_check.gpg_output)
 		fputs(signature_check.gpg_output, stderr);
 
-	free(signature_check.gpg_output);
-	free(signature_check.gpg_status);
-	free(signature_check.signer);
-	free(signature_check.key);
+	signature_check_clear(&signature_check);
 	return signature_check.result != 'G';
 }
 
diff --git a/gpg-interface.c b/gpg-interface.c
index 8b0e874..ff07012 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -7,6 +7,20 @@
 static char *configured_signing_key;
 static const char *gpg_program = "gpg";
 
+void signature_check_clear(struct signature_check *sigc)
+{
+	free(sigc->payload);
+	free(sigc->gpg_output);
+	free(sigc->gpg_status);
+	free(sigc->signer);
+	free(sigc->key);
+	sigc->payload = NULL;
+	sigc->gpg_output = NULL;
+	sigc->gpg_status = NULL;
+	sigc->signer = NULL;
+	sigc->key = NULL;
+}
+
 void set_signing_key(const char *key)
 {
 	free(configured_signing_key);
diff --git a/gpg-interface.h b/gpg-interface.h
index d727c25..37c23da 100644
--- a/gpg-interface.h
+++ b/gpg-interface.h
@@ -14,6 +14,7 @@ struct signature_check {
 	char *key;
 };
 
+extern void signature_check_clear(struct signature_check *sigc);
 extern int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key);
 extern int verify_signed_buffer(const char *payload, size_t payload_size, const char *signature, size_t signature_size, struct strbuf *gpg_output, struct strbuf *gpg_status);
 extern int git_gpg_config(const char *, const char *, void *);
diff --git a/pretty.c b/pretty.c
index 24fb877..ac901b8 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1537,10 +1537,7 @@ void format_commit_message(const struct commit *commit,
 
 	free(context.commit_encoding);
 	logmsg_free(context.message, commit);
-	free(context.signature_check.payload);
-	free(context.signature_check.gpg_output);
-	free(context.signature_check.gpg_status);
-	free(context.signature_check.signer);
+	signature_check_clear(&context.signature_check);
 }
 
 static void pp_header(struct pretty_print_context *pp,
-- 
2.0.0.426.g37dbf84

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