Patch "drm/msm/gem: Add check for kmalloc" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/msm/gem: Add check for kmalloc

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-msm-gem-add-check-for-kmalloc.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit cda169ace5fa843ccc4515cc7140a353ca86eaca
Author: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
Date:   Mon Dec 12 17:11:17 2022 +0800

    drm/msm/gem: Add check for kmalloc
    
    [ 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@xxxxxxxxxxx>
    Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
    Patchwork: https://patchwork.freedesktop.org/patch/514678/
    Link: https://lore.kernel.org/r/20221212091117.43511-1-jiasheng@xxxxxxxxxxx
    Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 1f74bab9e231a..83e6ccad77286 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -220,6 +220,10 @@ 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;