drm/i915/gvt: fix double free bug in split_2MB_gtt_entry

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[ Upstream commit 4a61648af6 ]

If intel_gvt_dma_map_guest_page failed, it will call
ppgtt_invalidate_spt, which will finally free the spt.
But the caller function ppgtt_populate_spt_by_guest_entry
does not notice that, it will free spt again in its error
path.

Fix this by canceling the mapping of DMA address and freeing sub_spt.
Besides, leave the handle of spt destroy to caller function instead
of callee function when error occurs.

Fixes: b901b252b6 ("drm/i915/gvt: Add 2M huge gtt support")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20221229165641.1192455-1-zyytlz.wz@163.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Zheng Wang 2022-12-30 00:56:41 +08:00 • committed by Greg Kroah-Hartman

parent 20a07570c1

commit 1022519da6

1 changed files with 13 additions and 4 deletions

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drivers/gpu/drm/i915/gvt/gtt.c

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