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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42abef81777sm178404725e9.27.2024.08.25.23.55.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Aug 2024 23:55:25 -0700 (PDT) Message-ID: <23f1b79be57f1a4d6ce0806fa149d687c2c6d275.camel@redhat.com> Subject: Re: [PATCH v3 7/9] vdpa: solidrun: Fix UB bug with devres From: Philipp Stanner To: Christophe JAILLET Cc: alexandre.torgue@foss.st.com, alvaro.karsz@solid-run.com, andy@kernel.org, axboe@kernel.dk, bhelgaas@google.com, brgl@bgdev.pl, broonie@kernel.org, corbet@lwn.net, davem@davemloft.net, dlechner@baylibre.com, dlemoal@kernel.org, edumazet@google.com, eperezma@redhat.com, hao.wu@intel.com, hare@suse.de, jasowang@redhat.com, joabreu@synopsys.com, kch@nvidia.com, kuba@kernel.org, linus.walleij@linaro.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-fpga@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, mcoquelin.stm32@gmail.com, mdf@kernel.org, mst@redhat.com, netdev@vger.kernel.org, pabeni@redhat.com, richardcochran@gmail.com, stable@vger.kernel.org, trix@redhat.com, u.kleine-koenig@pengutronix.de, virtualization@lists.linux.dev, xuanzhuo@linux.alibaba.com, yilun.xu@intel.com Date: Mon, 26 Aug 2024 08:55:22 +0200 In-Reply-To: <81de3898-9af7-4ad1-80ef-68d1f60d4c28@wanadoo.fr> References: <20240822134744.44919-1-pstanner@redhat.com> <20240822134744.44919-8-pstanner@redhat.com> <81de3898-9af7-4ad1-80ef-68d1f60d4c28@wanadoo.fr> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.4 (3.52.4-1.fc40) Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-08-22 at 16:34 +0200, Christophe JAILLET wrote: > Le 22/08/2024 =C3=A0 15:47, Philipp Stanner a =C3=A9crit=C2=A0: > > In psnet_open_pf_bar() and snet_open_vf_bar() a string later passed > > to > > pcim_iomap_regions() is placed on the stack. Neither > > pcim_iomap_regions() nor the functions it calls copy that string. > >=20 > > Should the string later ever be used, this, consequently, causes > > undefined behavior since the stack frame will by then have > > disappeared. > >=20 > > Fix the bug by allocating the strings on the heap through > > devm_kasprintf(). > >=20 > > Cc: stable@vger.kernel.org # v6.3 > > Fixes: 51a8f9d7f587 ("virtio: vdpa: new SolidNET DPU driver.") > > Reported-by: Christophe JAILLET > > Closes: > > https://lore.kernel.org/all/74e9109a-ac59-49e2-9b1d-d825c9c9f891@wanado= o.fr/ > > Suggested-by: Andy Shevchenko > > Signed-off-by: Philipp Stanner > > --- > > =C2=A0 drivers/vdpa/solidrun/snet_main.c | 13 +++++++++---- > > =C2=A0 1 file changed, 9 insertions(+), 4 deletions(-) > >=20 > > diff --git a/drivers/vdpa/solidrun/snet_main.c > > b/drivers/vdpa/solidrun/snet_main.c > > index 99428a04068d..67235f6190ef 100644 > > --- a/drivers/vdpa/solidrun/snet_main.c > > +++ b/drivers/vdpa/solidrun/snet_main.c > > @@ -555,7 +555,7 @@ static const struct vdpa_config_ops > > snet_config_ops =3D { > > =C2=A0=20 > > =C2=A0 static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet > > *psnet) > > =C2=A0 { > > - char name[50]; > > + char *name; > > =C2=A0=C2=A0 int ret, i, mask =3D 0; > > =C2=A0=C2=A0 /* We don't know which BAR will be used to communicate.. > > =C2=A0=C2=A0 * We will map every bar with len > 0. > > @@ -573,7 +573,10 @@ static int psnet_open_pf_bar(struct pci_dev > > *pdev, struct psnet *psnet) > > =C2=A0=C2=A0 return -ENODEV; > > =C2=A0=C2=A0 } > > =C2=A0=20 > > - snprintf(name, sizeof(name), "psnet[%s]-bars", > > pci_name(pdev)); > > + name =3D devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]- > > bars", pci_name(pdev)); > > + if (!name) > > + return -ENOMEM; > > + > > =C2=A0=C2=A0 ret =3D pcim_iomap_regions(pdev, mask, name); > > =C2=A0=C2=A0 if (ret) { > > =C2=A0=C2=A0 SNET_ERR(pdev, "Failed to request and map PCI > > BARs\n"); > > @@ -590,10 +593,12 @@ static int psnet_open_pf_bar(struct pci_dev > > *pdev, struct psnet *psnet) > > =C2=A0=20 > > =C2=A0 static int snet_open_vf_bar(struct pci_dev *pdev, struct snet > > *snet) > > =C2=A0 { > > - char name[50]; > > + char *name; > > =C2=A0=C2=A0 int ret; > > =C2=A0=20 > > - snprintf(name, sizeof(name), "snet[%s]-bar", > > pci_name(pdev)); > > + name =3D devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]- > > bars", pci_name(pdev)); >=20 > s/psnet/snet/ sharp eyes ;) Thx, P. >=20 > > + if (!name) > > + return -ENOMEM; > > =C2=A0=C2=A0 /* Request and map BAR */ > > =C2=A0=C2=A0 ret =3D pcim_iomap_regions(pdev, BIT(snet->psnet- > > >cfg.vf_bar), name); > > =C2=A0=C2=A0 if (ret) { >=20