From: Dan Carpenter Date: Thu, 17 Dec 2015 15:36:28 +0300 Subject: [13/16] drm/vc4: copy_to_user() returns the number of bytes remaining Origin: http://cgit.freedesktop.org/~airlied/linux/commit?id=65c4777de54a39b2722a4b1ff3306d044014d511 The copy_to/from_user() functions return the number of bytes remaining to be copied. We want to return error codes here. Also it's a bad idea to print an error message if a copy from user fails because users can use that to spam /var/log/messages which is annoying so I removed those. Fixes: 214613656b51 ('drm/vc4: Add an interface for capturing the GPU state after a hang.') Signed-off-by: Dan Carpenter Reviewed-by: Eric Anholt --- drivers/gpu/drm/vc4/vc4_gem.c | 37 ++++++++++++++++++------------------- 1 file changed, 18 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c index 39f29e7..461a16c 100644 --- a/drivers/gpu/drm/vc4/vc4_gem.c +++ b/drivers/gpu/drm/vc4/vc4_gem.c @@ -71,7 +71,7 @@ vc4_get_hang_state_ioctl(struct drm_device *dev, void *data, struct vc4_dev *vc4 = to_vc4_dev(dev); unsigned long irqflags; u32 i; - int ret; + int ret = 0; spin_lock_irqsave(&vc4->job_lock, irqflags); kernel_state = vc4->hang_state; @@ -119,9 +119,11 @@ vc4_get_hang_state_ioctl(struct drm_device *dev, void *data, bo_state[i].size = vc4_bo->base.base.size; } - ret = copy_to_user((void __user *)(uintptr_t)get_state->bo, - bo_state, - state->bo_count * sizeof(*bo_state)); + if (copy_to_user((void __user *)(uintptr_t)get_state->bo, + bo_state, + state->bo_count * sizeof(*bo_state))) + ret = -EFAULT; + kfree(bo_state); err_free: @@ -554,27 +556,24 @@ vc4_get_bcl(struct drm_device *dev, struct vc4_exec_info *exec) exec->shader_state = temp + exec_size; exec->shader_state_size = args->shader_rec_count; - ret = copy_from_user(bin, - (void __user *)(uintptr_t)args->bin_cl, - args->bin_cl_size); - if (ret) { - DRM_ERROR("Failed to copy in bin cl\n"); + if (copy_from_user(bin, + (void __user *)(uintptr_t)args->bin_cl, + args->bin_cl_size)) { + ret = -EFAULT; goto fail; } - ret = copy_from_user(exec->shader_rec_u, - (void __user *)(uintptr_t)args->shader_rec, - args->shader_rec_size); - if (ret) { - DRM_ERROR("Failed to copy in shader recs\n"); + if (copy_from_user(exec->shader_rec_u, + (void __user *)(uintptr_t)args->shader_rec, + args->shader_rec_size)) { + ret = -EFAULT; goto fail; } - ret = copy_from_user(exec->uniforms_u, - (void __user *)(uintptr_t)args->uniforms, - args->uniforms_size); - if (ret) { - DRM_ERROR("Failed to copy in uniforms cl\n"); + if (copy_from_user(exec->uniforms_u, + (void __user *)(uintptr_t)args->uniforms, + args->uniforms_size)) { + ret = -EFAULT; goto fail; }