commit: clear user-provided buffers

The functions `git_commit_header_field` and
`git_commit_extract_signature` both receive buffers used to hand back
the results to the user. While these functions called `git_buf_sanitize`
on these buffers, this is not the right thing to do, as it will simply
initialize or zero-terminate passed buffers. As we want to overwrite
contents, we instead have to call `git_buf_clear` to completely reset
them.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/commit.c b/src/commit.c
index 87ab2ab60..89a4db115 100644
--- a/src/commit.c
+++ b/src/commit.c
@@ -642,7 +642,7 @@ int git_commit_header_field(git_buf *out, const git_commit *commit, const char *
 {
 	const char *eol, *buf = commit->raw_header;
 
-	git_buf_sanitize(out);
+	git_buf_clear(out);
 
 	while ((eol = strchr(buf, '\n'))) {
 		/* We can skip continuations here */
@@ -706,8 +706,8 @@ int git_commit_extract_signature(git_buf *signature, git_buf *signed_data, git_r
 	const char *h, *eol;
 	int error;
 
-	git_buf_sanitize(signature);
-	git_buf_sanitize(signed_data);
+	git_buf_clear(signature);
+	git_buf_clear(signed_data);
 
 	if (!field)
 		field = "gpgsig";