In the Linux kernel, the following vulnerability has been resolved:

NFSD: Fix SECINFO_NO_NAME decode error cleanup

nfsd4_decode_secinfo_no_name() currently initializes sin_exp after
decoding sin_style. If the XDR stream is truncated, the decoder returns
nfserr_bad_xdr before sin_exp is initialized.

Since commit 3fdc54646234 ("NFSD: Reduce amount of struct
nfsd4_compoundargs that needs clearing"), the inline iops array is not
cleared between RPC calls. A failed SECINFO_NO_NAME decode can therefore
leave sin_exp holding stale union contents from a previous operation.

The error response path still invokes nfsd4_secinfo_no_name_release(),
which calls exp_put() on a non-NULL sin_exp.

Initialize sin_exp before the first failable decode step, matching
nfsd4_decode_secinfo().

https://git.kernel.org/stable/c/161d1aaeb04d620d3692639700512bb5038c1e10

https://git.kernel.org/stable/c/1e04be34cafae119e82bcaccd6d28a20f72a3647

https://git.kernel.org/stable/c/46eb17d45be69d28c7a23ea03283b207426a8232

https://git.kernel.org/stable/c/49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439

https://git.kernel.org/stable/c/5ec37edcb534f3fc92304be236d37f08e6545585

https://git.kernel.org/stable/c/8836405abdc53ca3dd5fc68b2cf6f8f012fad011

https://git.kernel.org/stable/c/9e18e83b8846a5c3fe13fc8a464b4865d33996c6

https://git.kernel.org/stable/c/c8a24effd96d4779e2ad779654682304491c55a5

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