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 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 -- 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
