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Fri, 29 May 2026 18:13:14 -0700 (PDT) Received: from ryzen ([2601:644:8000:5b5d:7285:c2ff:fe45:8a32]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84214cba602sm3230843b3a.40.2026.05.29.18.13.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 May 2026 18:13:13 -0700 (PDT) From: Rosen Penev To: linux-block@vger.kernel.org Cc: Ilya Dryomov , Dongsheng Yang , Jens Axboe , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , ceph-devel@vger.kernel.org (open list:RADOS BLOCK DEVICE (RBD)), linux-kernel@vger.kernel.org (open list), llvm@lists.linux.dev (open list:CLANG/LLVM BUILD SUPPORT:Keyword:\b(?i:clang|llvm)\b) Subject: [PATCH] rbd: check snap_count against RBD_MAX_SNAP_COUNT Date: Fri, 29 May 2026 18:12:55 -0700 Message-ID: <20260530011255.52916-1-rosenp@gmail.com> X-Mailer: git-send-email 2.54.0 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" snap_count is u32 but the comparison is against a SIZE_MAX-derived value (~2^61 on 64-bit), which clang flags as always false with -Wtautological-constant-out-of-range-compare. The proper check here should be that snap_count does not go over RBD_MAX_SNAP_COUNT. Assisted-by: Opencode:Big-pickle Signed-off-by: Rosen Penev Reviewed-by: Alex Elder --- drivers/block/rbd.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 94709466ad19..25215c209484 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -6075,12 +6075,9 @@ static int rbd_dev_v2_snap_context(struct rbd_device= *rbd_dev, =20 /* * Make sure the reported number of snapshot ids wouldn't go - * beyond the end of our buffer. But before checking that, - * make sure the computed size of the snapshot context we - * allocate is representable in a size_t. + * beyond the end of our buffer. */ - if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) - / sizeof (u64)) { + if (snap_count > RBD_MAX_SNAP_COUNT) { ret =3D -EINVAL; goto out; } --=20 2.54.0