[PATCH 2/5] free ref string returned by dwim_ref

[Jeff King <peff@peff.net>]

A call to "dwim_ref(name, len, flags, &ref)" will allocate a
new string in "ref" to return the exact ref we found. We do
not consistently free it in all code paths, leading to small
leaks. The worst is in get_sha1_basic, which may be called
many times (e.g., by "cat-file --batch"), though it is
relatively unlikely, as it only triggers on a bogus reflog
specification.

Signed-off-by: Jeff King <peff@peff.net>
---
 builtin/rev-parse.c   | 1 +
 builtin/show-branch.c | 1 +
 sha1_name.c           | 4 +++-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 8102aaa..d85e08c 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -151,6 +151,7 @@ static void show_rev(int type, const unsigned char *sha1, const char *name)
 				error("refname '%s' is ambiguous", name);
 				break;
 			}
+			free(full);
 		} else {
 			show_with_type(type, name);
 		}
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index 5fd4e4e..298c95e 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -777,6 +777,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 			sprintf(nth_desc, "%s@{%d}", *av, base+i);
 			append_ref(nth_desc, sha1, 1);
 		}
+		free(ref);
 	}
 	else if (all_heads + all_remotes)
 		snarf_refs(all_heads, all_remotes);
diff --git a/sha1_name.c b/sha1_name.c
index 6ccd3a5..63ee66f 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -540,8 +540,10 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 			char *tmp = xstrndup(str + at + 2, reflog_len);
 			at_time = approxidate_careful(tmp, &errors);
 			free(tmp);
-			if (errors)
+			if (errors) {
+				free(real_ref);
 				return -1;
+			}
 		}
 		if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
 				&co_time, &co_tz, &co_cnt)) {
-- 
2.0.0.566.gfe3e6b2