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drm/msm: Fix legacy relocs path 

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: 20224d715a ("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>
This commit is contained in:
Rob Clark 2021-02-04 14:53:11 -08:00
parent 7df222c359
commit c8d99bb938
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/msm/msm_gem_submit.c
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@ -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: */