aio: lookup_ioctx can return the wrong value when looking up a bogus context
The libaio test harness turned up a problem whereby lookup_ioctx on a
bogus io context was returning the 1 valid io context from the list
(harness/cases/3.p).
Because of that, an extra put_iocontext was done, and when the process
exited, it hit a BUG_ON in the put_iocontext macro called from exit_aio
(since we expect a users count of 1 and instead get 0).
The problem was introduced by "aio: make the lookup_ioctx() lockless"
(commit abf137dd7712132ee56d5b3143c2ff61a72a5faa).
Thanks to Zach for pointing out that hlist_for_each_entry_rcu will not
return with a NULL tpos at the end of the loop, even if the entry was
not found.
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Zach Brown <zach.brown@oracle.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/aio.c b/fs/aio.c
index 4a9d4d6..76da125 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -587,7 +587,7 @@
static struct kioctx *lookup_ioctx(unsigned long ctx_id)
{
struct mm_struct *mm = current->mm;
- struct kioctx *ctx = NULL;
+ struct kioctx *ctx, *ret = NULL;
struct hlist_node *n;
rcu_read_lock();
@@ -595,12 +595,13 @@
hlist_for_each_entry_rcu(ctx, n, &mm->ioctx_list, list) {
if (ctx->user_id == ctx_id && !ctx->dead) {
get_ioctx(ctx);
+ ret = ctx;
break;
}
}
rcu_read_unlock();
- return ctx;
+ return ret;
}
/*