From: Jiasheng Jiang jiasheng@iscas.ac.cn
[ Upstream commit d839f0811a31322c087a859c2b181e2383daa7be ]
Add the check for the return value of kmalloc in order to avoid NULL pointer dereference in copy_from_user.
Fixes: 20224d715a88 ("drm/msm/submit: Move copy_from_user ahead of locking bos") Signed-off-by: Jiasheng Jiang jiasheng@iscas.ac.cn Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Patchwork: https://patchwork.freedesktop.org/patch/514678/ Link: https://lore.kernel.org/r/20221212091117.43511-1-jiasheng@iscas.ac.cn Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/msm/msm_gem_submit.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c index 45a3e5cadc7da..7c2cc1262c05d 100644 --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -209,6 +209,10 @@ static int submit_lookup_cmds(struct msm_gem_submit *submit, goto out; } submit->cmd[i].relocs = kmalloc(sz, GFP_KERNEL); + if (!submit->cmd[i].relocs) { + ret = -ENOMEM; + goto out; + } ret = copy_from_user(submit->cmd[i].relocs, userptr, sz); if (ret) { ret = -EFAULT;