On Fri, Jun 29, 2018 at 11:48:18AM -0700, Kees Cook wrote: > In the quest to remove all stack VLA usage from the kernel[1], this > switches to using a kasprintf()ed buffer. Return paths are updated > to free the allocation. > > [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@xxxxxxxxxxxxxx Thanks for doing this. Acked-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx> > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> > --- > drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 7 +++++-- > drivers/gpu/drm/msm/adreno/adreno_gpu.c | 28 +++++++++++++++++-------- > 2 files changed, 24 insertions(+), 11 deletions(-) > > diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c > index d39400e5bc42..f5f76f8151f9 100644 > --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c > +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c > @@ -11,6 +11,7 @@ > * > */ > > +#include <linux/kernel.h> > #include <linux/types.h> > #include <linux/cpumask.h> > #include <linux/qcom_scm.h> > @@ -19,6 +20,7 @@ > #include <linux/soc/qcom/mdt_loader.h> > #include <linux/pm_opp.h> > #include <linux/nvmem-consumer.h> > +#include <linux/slab.h> > #include "msm_gem.h" > #include "msm_mmu.h" > #include "a5xx_gpu.h" > @@ -91,12 +93,13 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname) > ret = qcom_mdt_load(dev, fw, fwname, GPU_PAS_ID, > mem_region, mem_phys, mem_size, NULL); > } else { > - char newname[strlen("qcom/") + strlen(fwname) + 1]; > + char *newname; > > - sprintf(newname, "qcom/%s", fwname); > + newname = kasprintf(GFP_KERNEL, "qcom/%s", fwname); > > ret = qcom_mdt_load(dev, fw, newname, GPU_PAS_ID, > mem_region, mem_phys, mem_size, NULL); > + kfree(newname); > } > if (ret) > goto out; > diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c > index bcbf9f2a29f9..bfaafdfc7eb2 100644 > --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c > +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c > @@ -17,7 +17,9 @@ > * this program. If not, see <http://www.gnu.org/licenses/>. > */ > > +#include <linux/kernel.h> > #include <linux/pm_opp.h> > +#include <linux/slab.h> > #include "adreno_gpu.h" > #include "msm_gem.h" > #include "msm_mmu.h" > @@ -70,10 +72,12 @@ adreno_request_fw(struct adreno_gpu *adreno_gpu, const char *fwname) > { > struct drm_device *drm = adreno_gpu->base.dev; > const struct firmware *fw = NULL; > - char newname[strlen("qcom/") + strlen(fwname) + 1]; > + char *newname; > int ret; > > - sprintf(newname, "qcom/%s", fwname); > + newname = kasprintf(GFP_KERNEL, "qcom/%s", fwname); > + if (!newname) > + return ERR_PTR(-ENOMEM); > > /* > * Try first to load from qcom/$fwfile using a direct load (to avoid > @@ -87,11 +91,12 @@ adreno_request_fw(struct adreno_gpu *adreno_gpu, const char *fwname) > dev_info(drm->dev, "loaded %s from new location\n", > newname); > adreno_gpu->fwloc = FW_LOCATION_NEW; > - return fw; > + goto out; > } else if (adreno_gpu->fwloc != FW_LOCATION_UNKNOWN) { > dev_err(drm->dev, "failed to load %s: %d\n", > newname, ret); > - return ERR_PTR(ret); > + fw = ERR_PTR(ret); > + goto out; > } > } > > @@ -106,11 +111,12 @@ adreno_request_fw(struct adreno_gpu *adreno_gpu, const char *fwname) > dev_info(drm->dev, "loaded %s from legacy location\n", > newname); > adreno_gpu->fwloc = FW_LOCATION_LEGACY; > - return fw; > + goto out; > } else if (adreno_gpu->fwloc != FW_LOCATION_UNKNOWN) { > dev_err(drm->dev, "failed to load %s: %d\n", > fwname, ret); > - return ERR_PTR(ret); > + fw = ERR_PTR(ret); > + goto out; > } > } > > @@ -126,16 +132,20 @@ adreno_request_fw(struct adreno_gpu *adreno_gpu, const char *fwname) > dev_info(drm->dev, "loaded %s with helper\n", > newname); > adreno_gpu->fwloc = FW_LOCATION_HELPER; > - return fw; > + goto out; > } else if (adreno_gpu->fwloc != FW_LOCATION_UNKNOWN) { > dev_err(drm->dev, "failed to load %s: %d\n", > newname, ret); > - return ERR_PTR(ret); > + fw = ERR_PTR(ret); > + goto out; > } > } > > dev_err(drm->dev, "failed to load %s\n", fwname); > - return ERR_PTR(-ENOENT); > + fw = ERR_PTR(-ENOENT); > +out: > + kfree(newname); > + return fw; > } > > static int adreno_load_fw(struct adreno_gpu *adreno_gpu) > -- > 2.17.1 > > > -- > Kees Cook > Pixel Security -- The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
