1 files changed, 22 insertions, 11 deletions

diff --git a/ui-log.c b/ui-log.c
index 8592843..93af0ce 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -243,15 +243,19 @@ static void print_commit(struct commit *commit, struct rev_info *revs)
         cgit_free_commitinfo(info);
 }
 
-static const char *disambiguate_ref(const char *ref)
+static const char *disambiguate_ref(const char *ref, int *must_free_result)
 {
         unsigned char sha1[20];
-        const char *longref;
+        struct strbuf longref = STRBUF_INIT;
 
-        longref = fmt("refs/heads/%s", ref);
-        if (get_sha1(longref, sha1) == 0)
-                return longref;
+        strbuf_addf(&longref, "refs/heads/%s", ref);
+        if (get_sha1(longref.buf, sha1) == 0) {
+                *must_free_result = 1;
+                return strbuf_detach(&longref, NULL);
+        }
 
+        *must_free_result = 0;
+        strbuf_release(&longref);
         return ref;
 }
 
@@ -284,24 +288,26 @@ void cgit_print_log(const char *tip, int ofs, int cnt, char *grep, char *pattern
         struct commit *commit;
         struct vector vec = VECTOR_INIT(char *);
         int i, columns = commit_graph ? 4 : 3;
-        char *arg;
+        int must_free_tip = 0;
+        struct strbuf argbuf = STRBUF_INIT;
 
         /* First argv is NULL */
         vector_push(&vec, NULL, 0);
 
         if (!tip)
                 tip = ctx.qry.head;
-        tip = disambiguate_ref(tip);
+        tip = disambiguate_ref(tip, &must_free_tip);
         vector_push(&vec, &tip, 0);
 
         if (grep && pattern && *pattern) {
                 pattern = xstrdup(pattern);
                 if (!strcmp(grep, "grep") || !strcmp(grep, "author") ||
                     !strcmp(grep, "committer")) {
-                        arg = fmt("--%s=%s", grep, pattern);
-                        vector_push(&vec, &arg, 0);
+                        strbuf_addf(&argbuf, "--%s=%s", grep, pattern);
+                        vector_push(&vec, &argbuf.buf, 0);
                 }
                 if (!strcmp(grep, "range")) {
+                        char *arg;
                         /* Split the pattern at whitespace and add each token
                          * as a revision expression. Do not accept other
                          * rev-list options. Also, replace the previously
@@ -336,8 +342,8 @@ void cgit_print_log(const char *tip, int ofs, int cnt, char *grep, char *pattern
         }
 
         if (path) {
-                arg = "--";
-                vector_push(&vec, &arg, 0);
+                static const char *double_dash_arg = "--";
+                vector_push(&vec, &double_dash_arg, 0);
                 vector_push(&vec, &path, 0);
         }
 
@@ -430,4 +436,9 @@ void cgit_print_log(const char *tip, int ofs, int cnt, char *grep, char *pattern
                               ctx.qry.vpath, 0, NULL, NULL, ctx.qry.showmsg);
                 html("</td></tr>\n");
         }
+
+        /* If we allocated tip then it is safe to cast away const. */
+        if (must_free_tip)
+                free((char*) tip);
+        strbuf_release(&argbuf);
 }