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    Subject[PATCH 4.19 06/49] drm/nouveau/mem: guard against NULL pointer access in mem_del
    Date
    From: Karol Herbst <kherbst@redhat.com>

    commit d10285a25e29f13353bbf7760be8980048c1ef2f upstream.

    other drivers seems to do something similar

    Signed-off-by: Karol Herbst <kherbst@redhat.com>
    Cc: dri-devel <dri-devel@lists.freedesktop.org>
    Cc: Dave Airlie <airlied@redhat.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20201006220528.13925-2-kherbst@redhat.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/nouveau/nouveau_mem.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/gpu/drm/nouveau/nouveau_mem.c
    +++ b/drivers/gpu/drm/nouveau/nouveau_mem.c
    @@ -176,6 +176,8 @@ void
    nouveau_mem_del(struct ttm_mem_reg *reg)
    {
    struct nouveau_mem *mem = nouveau_mem(reg);
    + if (!mem)
    + return;
    nouveau_mem_fini(mem);
    kfree(reg->mm_node);
    reg->mm_node = NULL;

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