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Sun, 27 Sep 2026 07:24:45 -0700 (PDT) Received: from LAPTOP-QJLDGQ2L.lan ([47.82.103.134]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a0b9892dbfsm15424701a91.11.2026.09.27.07.24.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Sep 2026 07:24:45 -0700 (PDT) From: Boyan Liu To: Chuck Lever , Jeff Layton , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, co+7aebac19e62711ff@bugs.sh, Boyan Liu , stable@vger.kernel.org Subject: [PATCH] nfsd: Fix out-of-bounds read in clientstr_hashval() Date: Sun, 27 Sep 2026 22:23:19 +0800 Message-ID: <20260927142319.12054-1-yymhvert@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit clientstr_hashval() always hashes 8 bytes of the client name, but since commit 6b1891052a3f ("nfsd: make nfs4_client_reclaim use an xdr_netobj instead of a fixed char array") the name is a kmemdup()'d xdr_netobj of arbitrary length. A 1-7 byte ownerid is legal, so the hash reads past the allocation: BUG: KASAN: slab-out-of-bounds in nfsd4_find_reclaim_client Read of size 1 at addr ffff888010acf1a1 by task nfsd/141 Call Trace: kasan_report (mm/kasan/report.c:595) nfsd4_find_reclaim_client (fs/nfsd/nfs4state.c:1622) nfsd4_reclaim_complete (fs/nfsd/nfs4state.c:5286) nfsd4_proc_compound (fs/nfsd/nfs4proc.c:3313) nfsd_dispatch (fs/nfsd/nfssvc.c:1038) svc_process_common (net/sunrpc/svc.c:1527) svc_process (net/sunrpc/svc.c:1682) svc_recv (net/sunrpc/svc_xprt.c:886) nfsd (fs/nfsd/nfssvc.c:919) The hash only selects a bucket; compare_blob() does the real comparison. Hash the actual length, like ownerstr_hashval() does. Fixes: 6b1891052a3f ("nfsd: make nfs4_client_reclaim use an xdr_netobj instead of a fixed char array") Cc: stable@vger.kernel.org Reported-by: co+7aebac19e62711ff@bugs.sh Signed-off-by: Boyan Liu --- fs/nfsd/nfs4state.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 18e17232c..6c50286fa 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1619,7 +1619,7 @@ static unsigned int clientid_hashval(u32 id) static unsigned int clientstr_hashval(struct xdr_netobj name) { - return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK; + return opaque_hashval(name.data, name.len) & CLIENT_HASH_MASK; } /* -- 2.43.0