read-cache: fix memory leak in do_write_index

The previous_name_buf was never getting released when there
was an error in ce_write_entry or allow was false and execution
was returned to the caller.

Signed-off-by: Kevin Willford <kewillf@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/read-cache.c b/read-cache.c
index acfb028..47220cc 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -2192,7 +2192,7 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
        int newfd = tempfile->fd;
        git_SHA_CTX c;
        struct cache_header hdr;
-       int i, err, removed, extended, hdr_version;
+       int i, err = 0, removed, extended, hdr_version;
        struct cache_entry **cache = istate->cache;
        int entries = istate->cache_nr;
        struct stat st;
@@ -2247,15 +2247,21 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
                        if (allow)
                                warning(msg, ce->name);
                        else
-                               return error(msg, ce->name);
+                               err = error(msg, ce->name);
 
                        drop_cache_tree = 1;
                }
                if (ce_write_entry(&c, newfd, ce, previous_name) < 0)
-                       return -1;
+                       err = -1;
+
+               if (err)
+                       break;
        }
        strbuf_release(&previous_name_buf);
 
+       if (err)
+               return err;
+
        /* Write extension data here */
        if (!strip_extensions && istate->split_index) {
                struct strbuf sb = STRBUF_INIT;