[PATCH v2 2/3] builtin/commit-graph.c: UNLEAK variables

[Martin Ågren via GitGitGadget]

From: =?UTF-8?q?Martin=20=C3=85gren?= <martin.ag...@gmail.com>

`graph_verify()`, `graph_read()` and `graph_write()` do the hard work of
`cmd_commit_graph()`. As soon as these return, so does
`cmd_commit_graph()`.

`strbuf_getline()` may allocate memory in the strbuf, yet return EOF.
We need to release the strbuf or UNLEAK it. Go for the latter since we
are close to returning from `graph_write()`.

`graph_write()` also fails to free the strings in the string list. They
have been added to the list with `strdup_strings` set to 0. We could
flip `strdup_strings` before clearing the list, which is our usual hack
in situations like this. But since we are about to exit, let's just
UNLEAK the whole string list instead.

UNLEAK `graph` in `graph_verify`. While at it, and for consistency,
UNLEAK in `graph_read()` as well, and remove an unnecessary UNLEAK just
before dying.

Signed-off-by: Martin Ågren <martin.ag...@gmail.com>
Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
 builtin/commit-graph.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index bc0fa9ba52..66f12eb009 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -64,6 +64,7 @@ static int graph_verify(int argc, const char **argv)
        if (!graph)
                return 0;
 
+       UNLEAK(graph);
        return verify_commit_graph(the_repository, graph);
 }
 
@@ -89,10 +90,8 @@ static int graph_read(int argc, const char **argv)
        graph_name = get_commit_graph_filename(opts.obj_dir);
        graph = load_commit_graph_one(graph_name);
 
-       if (!graph) {
-               UNLEAK(graph_name);
+       if (!graph)
                die("graph file %s does not exist", graph_name);
-       }
 
        FREE_AND_NULL(graph_name);
 
@@ -115,7 +114,7 @@ static int graph_read(int argc, const char **argv)
                printf(" large_edges");
        printf("\n");
 
-       free_commit_graph(graph);
+       UNLEAK(graph);
 
        return 0;
 }
@@ -166,6 +165,8 @@ static int graph_write(int argc, const char **argv)
                        pack_indexes = &lines;
                if (opts.stdin_commits)
                        commit_hex = &lines;
+
+               UNLEAK(buf);
        }
 
        write_commit_graph(opts.obj_dir,
@@ -174,7 +175,7 @@ static int graph_write(int argc, const char **argv)
                           opts.append,
                           1);
 
-       string_list_clear(&lines, 0);
+       UNLEAK(lines);
        return 0;
 }
 
-- 
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