diff options
| author | Al Viro <viro@ZenIV.linux.org.uk> | 2012-03-07 05:16:35 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-03-19 08:57:43 -0700 |
| commit | 8ef749e355dfb8932d4ae6d4aa8eacf3b0ab4444 (patch) | |
| tree | b29bb3b2466c150dfe13cb7d81bbbeec3a0f50b0 /arch/x86 | |
| parent | 0d9de88703f09127c0902a6c24178adf4d1a29aa (diff) | |
aio: fix io_setup/io_destroy race
commit 86b62a2cb4fc09037bbce2959d2992962396fd7f upstream.
Have ioctx_alloc() return an extra reference, so that caller would drop it
on success and not bother with re-grabbing it on failure exit. The current
code is obviously broken - io_destroy() from another thread that managed
to guess the address io_setup() would've returned would free ioctx right
under us; gets especially interesting if aio_context_t * we pass to
io_setup() points to PROT_READ mapping, so put_user() fails and we end
up doing io_destroy() on kioctx another thread has just got freed...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Benjamin LaHaise <bcrl@kvack.org>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86')
0 files changed, 0 insertions, 0 deletions