safe_create_leading_directories: fix race that could give a false negative

diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 8b5c1eb33e18cdec0f74e246e501f50461757e9a..953dd3004e285ce7aa0432f4fe0eacb0d0c2c887 100644 (file)
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -40,8 +40,8 @@ struct base_data {
        int ofs_first, ofs_last;
 };
 
-#if !defined(NO_PTHREADS) && defined(NO_PREAD)
-/* NO_PREAD uses compat/pread.c, which is not thread-safe. Disable threading. */
+#if !defined(NO_PTHREADS) && defined(NO_THREAD_SAFE_PREAD)
+/* pread() emulation is not thread-safe. Disable threading. */
 #define NO_PTHREADS
 #endif
 
@@ -524,7 +524,6 @@ static void *unpack_data(struct object_entry *obj,
        stream.avail_out = consume ? 64*1024 : obj->size;
 
        do {
-               unsigned char *last_out = stream.next_out;
                ssize_t n = (len < 64*1024) ? len : 64*1024;
                n = pread(pack_fd, inbuf, n, from);
                if (n < 0)
@@ -538,15 +537,19 @@ static void *unpack_data(struct object_entry *obj,
                len -= n;
                stream.next_in = inbuf;
                stream.avail_in = n;
-               status = git_inflate(&stream, 0);
-               if (consume) {
-                       if (consume(last_out, stream.next_out - last_out, cb_data)) {
-                               free(inbuf);
-                               free(data);
-                               return NULL;
-                       }
-                       stream.next_out = data;
-                       stream.avail_out = 64*1024;
+               if (!consume)
+                       status = git_inflate(&stream, 0);
+               else {
+                       do {
+                               status = git_inflate(&stream, 0);
+                               if (consume(data, stream.next_out - data, cb_data)) {
+                                       free(inbuf);
+                                       free(data);
+                                       return NULL;
+                               }
+                               stream.next_out = data;
+                               stream.avail_out = 64*1024;
+                       } while (status == Z_OK && stream.avail_in);
                }
        } while (len && status == Z_OK && !stream.avail_in);