[PATCH v2 21/25] add_reflog_for_walk: avoid memory leak

[Johannes Schindelin]

We free()d the `log` buffer when dwim_log() returned 1, but not when it
returned a larger value (which meant that it still allocated the buffer
but we simply ignored it).

While in the vicinity, make sure that the `reflogs` structure as well as
the `branch` variable are released properly, too.

Identified by Coverity.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 reflog-walk.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/reflog-walk.c b/reflog-walk.c
index 99679f58255..c63eb1a3fd7 100644
--- a/reflog-walk.c
+++ b/reflog-walk.c
@@ -183,7 +183,11 @@ int add_reflog_for_walk(struct reflog_walk_info *info,
                if (!reflogs || reflogs->nr == 0) {
                        struct object_id oid;
                        char *b;
-                       if (dwim_log(branch, strlen(branch), oid.hash, &b) == 
1) {
+                       int ret = dwim_log(branch, strlen(branch),
+                                          oid.hash, &b);
+                       if (ret > 1)
+                               free(b);
+                       else if (ret == 1) {
                                if (reflogs) {
                                        free(reflogs->ref);
                                        free(reflogs);
@@ -193,17 +197,27 @@ int add_reflog_for_walk(struct reflog_walk_info *info,
                                reflogs = read_complete_reflog(branch);
                        }
                }
-               if (!reflogs || reflogs->nr == 0)
+               if (!reflogs || reflogs->nr == 0) {
+                       if (reflogs) {
+                               free(reflogs->ref);
+                               free(reflogs);
+                       }
+                       free(branch);
                        return -1;
+               }
                string_list_insert(&info->complete_reflogs, branch)->util
                        = reflogs;
        }
+       free(branch);
 
        commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
        if (recno < 0) {
                commit_reflog->recno = get_reflog_recno_by_time(reflogs, 
timestamp);
                if (commit_reflog->recno < 0) {
-                       free(branch);
+                       if (reflogs) {
+                               free(reflogs->ref);
+                               free(reflogs);
+                       }
                        free(commit_reflog);
                        return -1;
                }
-- 
2.12.2.windows.2.800.gede8f145e06