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([2409:4040:6e99:f02a:954f:e157:760e:3d30]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-211d0f346d7sm26078255ad.138.2024.11.16.03.40.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 16 Nov 2024 03:40:38 -0800 (PST) From: Suraj Sonawane To: surajsonawane0215@gmail.com, dan.j.williams@intel.com Cc: dave.jiang@intel.com, ira.weiny@intel.com, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, rafael@kernel.org, syzbot+7534f060ebda6b8b51b3@syzkaller.appspotmail.com, vishal.l.verma@intel.com Subject: [PATCH v5] acpi: nfit: vmalloc-out-of-bounds Read in acpi_nfit_ctl Date: Sat, 16 Nov 2024 17:10:27 +0530 Message-Id: <20241116114027.19303-1-surajsonawane0215@gmail.com> X-Mailer: git-send-email 2.34.1 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" Fix an issue detected by syzbot with KASAN: BUG: KASAN: vmalloc-out-of-bounds in cmd_to_func drivers/acpi/nfit/ core.c:416 [inline] BUG: KASAN: vmalloc-out-of-bounds in acpi_nfit_ctl+0x20e8/0x24a0 drivers/acpi/nfit/core.c:459 The issue occurs in cmd_to_func when the call_pkg->nd_reserved2 array is accessed without verifying that call_pkg points to a buffer that is appropriately sized as a struct nd_cmd_pkg. This can lead to out-of-bounds access and undefined behavior if the buffer does not have sufficient space. To address this, a check was added in acpi_nfit_ctl() to ensure that buf is not NULL and that buf_len is less than sizeof(*call_pkg) before accessing it. This ensures safe access to the members of call_pkg, including the nd_reserved2 array. Reported-by: syzbot+7534f060ebda6b8b51b3@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D7534f060ebda6b8b51b3 Tested-by: syzbot+7534f060ebda6b8b51b3@syzkaller.appspotmail.com Fixes: ebe9f6f19d80 ("acpi/nfit: Fix bus command validation") Signed-off-by: Suraj Sonawane --- V1: https://lore.kernel.org/lkml/20241111080429.9861-1-surajsonawane0215@gm= ail.com/=20 V2: Initialized `out_obj` to `NULL` in `acpi_nfit_ctl()` to prevent potential uninitialized variable usage if condition is true. V3: Changed the condition to if (!buf || buf_len < sizeof(*call_pkg)) and updated the Fixes tag to reference the correct commit. V4: Removed the explicit cast to maintain the original code style. V5: Re-Initialized `out_obj` to NULL. To prevent potential uninitialized variable usage if condition is true. drivers/acpi/nfit/core.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 5429ec9ef..573ed264c 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -439,7 +439,7 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc= , struct nvdimm *nvdimm, { struct acpi_nfit_desc *acpi_desc =3D to_acpi_desc(nd_desc); struct nfit_mem *nfit_mem =3D nvdimm_provider_data(nvdimm); - union acpi_object in_obj, in_buf, *out_obj; + union acpi_object in_obj, in_buf, *out_obj =3D NULL; const struct nd_cmd_desc *desc =3D NULL; struct device *dev =3D acpi_desc->dev; struct nd_cmd_pkg *call_pkg =3D NULL; @@ -454,8 +454,15 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_des= c, struct nvdimm *nvdimm, if (cmd_rc) *cmd_rc =3D -EINVAL; =20 - if (cmd =3D=3D ND_CMD_CALL) + if (cmd =3D=3D ND_CMD_CALL) { + if (!buf || buf_len < sizeof(*call_pkg)) { + rc =3D -EINVAL; + goto out; + } + call_pkg =3D buf; + } + func =3D cmd_to_func(nfit_mem, cmd, call_pkg, &family); if (func < 0) return func; --=20 2.34.1