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| author | Oleg Nesterov <oleg@redhat.com> | 2009-03-12 14:31:28 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-16 17:32:30 -0700 |
| commit | f450e06e1f1d3e3b41698c3ada4a6177d30b603b (patch) | |
| tree | 7defbf285b6f2715b27875cf4e37dc43f190964f | |
| parent | 63ece5db5eb71b8742f1bae32d10a67c8b6e56cd (diff) | |
| download | linux-stable-f450e06e1f1d3e3b41698c3ada4a6177d30b603b.tar.gz | |
pipe_rdwr_fasync: fix the error handling to prevent the leak/crash
commit e5bc49ba7439b9726006d031d440cba96819f0f8 upstream.
If the second fasync_helper() fails, pipe_rdwr_fasync() returns the error
but leaves the file on ->fasync_readers.
This was always wrong, but since 233e70f4228e78eb2f80dc6650f65d3ae3dbf17c
"saner FASYNC handling on file close" we have the new problem. Because in
this case setfl() doesn't set FASYNC bit, __fput() will not do
->fasync(0), and we leak fasync_struct with ->fa_file pointing to the
freed file.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/pipe.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/pipe.c b/fs/pipe.c index 47b34d235419..01f8b781c0c5 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -699,12 +699,12 @@ pipe_rdwr_fasync(int fd, struct file *filp, int on) int retval; mutex_lock(&inode->i_mutex); - retval = fasync_helper(fd, filp, on, &pipe->fasync_readers); - - if (retval >= 0) + if (retval >= 0) { retval = fasync_helper(fd, filp, on, &pipe->fasync_writers); - + if (retval < 0) /* this can happen only if on == T */ + fasync_helper(-1, filp, 0, &pipe->fasync_readers); + } mutex_unlock(&inode->i_mutex); if (retval < 0) |