From: NeilBrown Date: Wed, 22 Sep 2010 02:55:06 +0000 (+1000) Subject: sunrpc: fix race in new cache_wait code. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=277f68dbba397997c7f3dc843d14afa1654bb80e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git sunrpc: fix race in new cache_wait code. If we set up to wait for a cache item to be filled in, and then find that it is no longer pending, it could be that some other thread is in 'cache_revisit_request' and has moved our request to its 'pending' list. So when our setup_deferral calls cache_revisit_request it will find nothing to put on the pending list, and do nothing. We then return from cache_wait_req, thus leaving the 'sleeper' on-stack structure open to being corrupted by subsequent stack usage. However that 'sleeper' could still be on the 'pending' list that the other thread is looking at and so any corruption could cause it to behave badly. To avoid this race we simply take the same path as if the 'wait_for_completion_interruptible_timeout' was interrupted and if the sleeper is no longer on the list (which it won't be) we wait on the completion - which will ensure that any other cache_revisit_request will have let go of the sleeper. Signed-off-by: NeilBrown Signed-off-by: J. Bruce Fields --- diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index e20968aac68a..1e72cc955931 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -578,10 +578,9 @@ static int cache_wait_req(struct cache_req *req, struct cache_head *item) dreq->revisit = cache_restart_thread; ret = setup_deferral(dreq, item); - if (ret) - return ret; - if (wait_for_completion_interruptible_timeout( + if (ret || + wait_for_completion_interruptible_timeout( &sleeper.completion, req->thread_wait) <= 0) { /* The completion wasn't completed, so we need * to clean up