From: Rob Clark robdclark@chromium.org
[ Upstream commit c8d99bb938d3303989c4988caf090084073e85a2 ]
In moving code around, we ended up using the same pointer to copy_from_user() the relocs tables as we used for the cmd table entry, which is clearly not right. This went unnoticed because modern mesa on non-ancent kernels does not actually use relocs. But this broke ancient mesa on modern kernels.
Reported-by: Emil Velikov emil.velikov@collabora.com Fixes: 20224d715a88 ("drm/msm/submit: Move copy_from_user ahead of locking bos") Signed-off-by: Rob Clark robdclark@chromium.org Reviewed-by: Akhil P Oommen akhilpo@codeaurora.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/msm/msm_gem_submit.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c index d04c349d8112a..5480852bdedaf 100644 --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -198,6 +198,8 @@ static int submit_lookup_cmds(struct msm_gem_submit *submit, submit->cmd[i].idx = submit_cmd.submit_idx; submit->cmd[i].nr_relocs = submit_cmd.nr_relocs;
+ userptr = u64_to_user_ptr(submit_cmd.relocs); + sz = array_size(submit_cmd.nr_relocs, sizeof(struct drm_msm_gem_submit_reloc)); /* check for overflow: */