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Wed, 16 Jul 2025 07:38:51 -0700 (PDT) From: Antonio Quartulli To: linux-nfs@vger.kernel.org Cc: Antonio Quartulli , Trond Myklebust , Anna Schumaker , Sergey Bashirov , Konstantin Evtushenko , linux-kernel@vger.kernel.org Subject: [PATCH] pNFS: fix uninitialized pointer access Date: Wed, 16 Jul 2025 16:38:48 +0200 Message-ID: <20250716143848.14713-1-antonio@mandelbit.com> X-Mailer: git-send-email 2.49.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In ext_tree_encode_commit() if no block extent is encoded due to lack of buffer space, ret is set to -ENOSPC and we end up accessing be_prev despite it being uninitialized. Fix this behaviour by bailing out right away when no extent is encoded. Fixes: d84c4754f874 ("pNFS: Fix extent encoding in block/scsi layout") Addresses-Coverity-ID: 1647611 ("Memory - illegal accesses (UNINIT)") Signed-off-by: Antonio Quartulli --- fs/nfs/blocklayout/extent_tree.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/nfs/blocklayout/extent_tree.c b/fs/nfs/blocklayout/extent_t= ree.c index 315949a7e92d..82e19205f425 100644 --- a/fs/nfs/blocklayout/extent_tree.c +++ b/fs/nfs/blocklayout/extent_tree.c @@ -598,6 +598,11 @@ ext_tree_encode_commit(struct pnfs_block_layout *bl, _= _be32 *p, if (ext_tree_layoutupdate_size(bl, *count) > buffer_size) { (*count)--; ret =3D -ENOSPC; + /* bail out right away if no extent was encoded */ + if (!*count) { + spin_unlock(&bl->bl_ext_lock); + return ret; + } break; } =20 --=20 2.49.1