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NFSD: Prevent NULL dereference in nfsd4_process_cb_update()

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[ Upstream commit 1e02c641c3a43c88cecc08402000418e15578d38 ]

@ses is initialized to NULL. If __nfsd4_find_backchannel() finds no
available backchannel session, setup_callback_client() will try to
dereference @ses and segfault.

Fixes: dcbeaa68db ("nfsd4: allow backchannel recovery")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chuck Lever 2024-10-17 11:03:53 -04:00 • committed by Greg Kroah-Hartman
parent 68c3b7cdef
commit cac1405e3f
1 changed files with 2 additions and 0 deletions
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2
fs/nfsd/nfs4callback.c
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@ -1229,6 +1229,8 @@ static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
ses = c->cn_session;
}
spin_unlock(&clp->cl_lock);
if (!c)
return;
err = setup_callback_client(clp, &conn, ses);
if (err) {