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vfs: fix pipe counter breakage

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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@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2013-03-12 02:59:49 +00:00 committed by Linus Torvalds
parent 7c6baa304b
commit a930d87905
1 changed files with 3 additions and 0 deletions
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3
fs/pipe.c
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@ -863,6 +863,9 @@ pipe_rdwr_open(struct inode *inode, struct file *filp)
{
int ret = -ENOENT;
if (!(filp->f_mode & (FMODE_READ|FMODE_WRITE)))
return -EINVAL;
mutex_lock(&inode->i_mutex);
if (inode->i_pipe) {