linux-kernel - [PATCH 41/44] kdbus: Fix memfd install algorithm

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Date:	Thu,  8 Oct 2015 14:32:10 +0300
From:	Sergei Zviagintsev <sergei@...v.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Cc:	linux-kernel@...r.kernel.org, Sergei Zviagintsev <sergei@...v.net>
Subject: [PATCH 41/44] kdbus: Fix memfd install algorithm

If file descriptor allocation for memfd fails, we do not fill the
corresponding position in `fds' array with -1. Later when we install
memfds, fds[gaps->n_fds + i] will contain garbage which we pass then
to fd_install(). Fix it by adding -1 to `fds' in case when we can't
get free file descriptor for memfd.

Signed-off-by: Sergei Zviagintsev <sergei@...v.net>
---
 ipc/kdbus/message.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ipc/kdbus/message.c b/ipc/kdbus/message.c
index f2176796390d..0653a085c104 100644
--- a/ipc/kdbus/message.c
+++ b/ipc/kdbus/message.c
@@ -181,6 +181,7 @@ int kdbus_gaps_install(struct kdbus_gaps *gaps, struct kdbus_pool_slice *slice,
 		memfd = get_unused_fd_flags(O_CLOEXEC);
 		if (memfd < 0) {
 			incomplete_fds = true;
+			fds[n_fds++] = -1;
 			/* memfds are initialized to -1, skip copying it */
 			continue;
 		}
-- 
1.8.3.1

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