From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Tue, 18 Feb 2020 01:13:49 +0000 (-0500)
Subject: Fix: directory-handle: use of free'd handle on fstat() error
X-Git-Tag: v2.13.0-rc1~749
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=b2081a0f39bce45b3d1cf063308a9b77712f1a9f;p=lttng-tools.git

Fix: directory-handle: use of free'd handle on fstat() error

On an error to fstat a directory handle, a directory handle is
released and is still initialized as if the error had not occurred.

Return NULL early from lttng_directory_handle_create_from_dirfd()
to prevent those erroneous accesses.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ia2a3bb1cfe8c90d3f7f87a68286a9b8524694d3c
---

diff --git a/src/common/compat/directory-handle.c b/src/common/compat/directory-handle.c
index 9d2fed463..a790c5b79 100644
--- a/src/common/compat/directory-handle.c
+++ b/src/common/compat/directory-handle.c
@@ -164,6 +164,8 @@ struct lttng_directory_handle *lttng_directory_handle_create_from_dirfd(
 		if (ret) {
 			PERROR("Failed to fstat directory file descriptor %i", dirfd);
 			lttng_directory_handle_release(&handle->ref);
+			handle = NULL;
+			goto end;
 		}
 	} else {
 		handle->directory_inode = RESERVED_AT_FDCWD_INO;