difftool: address a couple of resource/memory leaks

diff --git a/builtin/merge-file.c b/builtin/merge-file.c
index 13e22a2f0be73ec7e521a02d1f36c414e77a8700..47dde7c39c922c77bf388e87db27618d09f5bb74 100644 (file)
--- a/builtin/merge-file.c
+++ b/builtin/merge-file.c
@@ -28,7 +28,6 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
        xmparam_t xmp = {{0}};
        int ret = 0, i = 0, to_stdout = 0;
        int quiet = 0;
-       int prefixlen = 0;
        struct option options[] = {
                OPT_BOOL('p', "stdout", &to_stdout, N_("send results to standard output")),
                OPT_SET_INT(0, "diff3", &xmp.style, N_("use a diff3 based merge"), XDL_MERGE_DIFF3),
@@ -65,15 +64,19 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
                        return error_errno("failed to redirect stderr to /dev/null");
        }
 
-       if (prefix)
-               prefixlen = strlen(prefix);
-
        for (i = 0; i < 3; i++) {
-               const char *fname = prefix_filename(prefix, prefixlen, argv[i]);
+               char *fname;
+               int ret;
+
                if (!names[i])
                        names[i] = argv[i];
-               if (read_mmfile(mmfs + i, fname))
+
+               fname = prefix_filename(prefix, argv[i]);
+               ret = read_mmfile(mmfs + i, fname);
+               free(fname);
+               if (ret)
                        return -1;
+
                if (mmfs[i].size > MAX_XDIFF_SIZE ||
                    buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
                        return error("Cannot merge binary files: %s",
@@ -90,7 +93,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
 
        if (ret >= 0) {
                const char *filename = argv[0];
-               const char *fpath = prefix_filename(prefix, prefixlen, argv[0]);
+               char *fpath = prefix_filename(prefix, argv[0]);
                FILE *f = to_stdout ? stdout : fopen(fpath, "wb");
 
                if (!f)
@@ -102,6 +105,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
                else if (fclose(f))
                        ret = error_errno("Could not close %s", filename);
                free(result.ptr);
+               free(fpath);
        }
 
        if (ret > 127)