This is a note to let you know that I've just added the patch titled
vfs: fix pipe counter breakage
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vfs-fix-pipe-counter-breakage.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a930d8790552658140d7d0d2e316af4f0d76a512 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Tue, 12 Mar 2013 02:59:49 +0000
Subject: vfs: fix pipe counter breakage
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
commit a930d8790552658140d7d0d2e316af4f0d76a512 upstream.
If you open a pipe for neither read nor write, the pipe code will not
add any usage counters to the pipe, causing the 'struct pipe_inode_info"
to be potentially released early.
That doesn't normally matter, since you cannot actually use the pipe,
but the pipe release code - particularly fasync handling - still expects
the actual pipe infrastructure to all be there. And rather than adding
NULL pointer checks, let's just disallow this case, the same way we
already do for the named pipe ("fifo") case.
This is ancient going back to pre-2.4 days, and until trinity, nobody
naver noticed.
Reported-by: Dave Jones <davej@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/pipe.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -859,6 +859,9 @@ pipe_rdwr_open(struct inode *inode, stru
{
int ret = -ENOENT;
+ if (!(filp->f_mode & (FMODE_READ|FMODE_WRITE)))
+ return -EINVAL;
+
mutex_lock(&inode->i_mutex);
if (inode->i_pipe) {
Patches currently in stable-queue which might be from viro@xxxxxxxxxxxxxxxxxx are
queue-3.0/vfs-fix-pipe-counter-breakage.patch
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