update-index: plug memory leak from prefix_path()

prefix_path() sometimes allocates new memory and returns it, and
other times returns the incoming path argument intact.  The
callers need to be a bit careful not to leak memory.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/update-index.c b/update-index.c
index 1870ac7..d63f8ac 100644 (file)
--- a/update-index.c
+++ b/update-index.c
@@ -364,23 +364,26 @@ static void update_one(const char *path, const char *prefix, int prefix_length)
        const char *p = prefix_path(prefix, prefix_length, path);
        if (!verify_path(p)) {
                fprintf(stderr, "Ignoring path %s\n", path);
-               return;
+               goto free_return;
        }
        if (mark_valid_only) {
                if (mark_valid(p))
                        die("Unable to mark file %s", path);
-               return;
+               goto free_return;
        }
 
        if (force_remove) {
                if (remove_file_from_cache(p))
                        die("git-update-index: unable to remove %s", path);
                report("remove '%s'", path);
-               return;
+               goto free_return;
        }
        if (add_file_to_cache(p))
                die("Unable to process file %s", path);
        report("add '%s'", path);
+ free_return:
+       if (p != path)
+               free((char*)p);
 }
 
 static void read_index_info(int line_termination)
@@ -735,6 +738,7 @@ int main(int argc, const char **argv)
                strbuf_init(&buf);
                while (1) {
                        char *path_name;
+                       const char *p;
                        read_line(&buf, stdin, line_termination);
                        if (buf.eof)
                                break;
@@ -742,11 +746,12 @@ int main(int argc, const char **argv)
                                path_name = unquote_c_style(buf.buf, NULL);
                        else
                                path_name = buf.buf;
-                       update_one(path_name, prefix, prefix_length);
-                       if (set_executable_bit) {
-                               const char *p = prefix_path(prefix, prefix_length, path_name);
+                       p = prefix_path(prefix, prefix_length, path_name);
+                       update_one(p, NULL, 0);
+                       if (set_executable_bit)
                                chmod_path(set_executable_bit, p);
-                       }
+                       if (p != path_name)
+                               free((char*) p);
                        if (path_name != buf.buf)
                                free(path_name);
                }