NFSv4.0: Fix a use-after-free problem in the asynchronous open()

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[ Upstream commit 2fdb05dc09 ]

Yang Erkun reports that when two threads are opening files at the same
time, and are forced to abort before a reply is seen, then the call to
nfs_release_seqid() in nfs4_opendata_free() can result in a
use-after-free of the pointer to the defunct rpc task of the other
thread.
The fix is to ensure that if the RPC call is aborted before the call to
nfs_wait_on_sequence() is complete, then we must call nfs_release_seqid()
in nfs4_open_release() before the rpc_task is freed.

Reported-by: Yang Erkun <yangerkun@huawei.com>
Fixes: 24ac23ab88 ("NFSv4: Convert open() into an asynchronous RPC call")
Reviewed-by: Yang Erkun <yangerkun@huawei.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Trond Myklebust 2024-11-08 12:13:31 -05:00 • committed by Greg Kroah-Hartman

parent e7b5a40b9b

commit 229a30ed42

1 changed files with 5 additions and 3 deletions

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fs/nfs/nfs4proc.c

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