Patch "media: platform: mtk-mdp3: Add missing check and free for ida_alloc" has been added to the 6.1-stable tree

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

    media: platform: mtk-mdp3: Add missing check and free for ida_alloc

to the 6.1-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:
     media-platform-mtk-mdp3-add-missing-check-and-free-f.patch
and it can be found in the queue-6.1 subdirectory.

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



commit 6a789242f5798002ce5e136669d52d7964969156
Author: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
Date:   Thu Feb 9 14:52:45 2023 +0100

    media: platform: mtk-mdp3: Add missing check and free for ida_alloc
    
    [ Upstream commit d00f592250782538cda87745607695b0fe27dcd4 ]
    
    Add the check for the return value of the ida_alloc in order to avoid
    NULL pointer dereference.
    Moreover, free allocated "ctx->id" if mdp_m2m_open fails later in order
    to avoid memory leak.
    
    Fixes: 61890ccaefaf ("media: platform: mtk-mdp3: add MediaTek MDP3 driver")
    Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
    Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
    Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c
index 5f74ea3b7a524..8612a48bde10f 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c
@@ -566,7 +566,11 @@ static int mdp_m2m_open(struct file *file)
 		goto err_free_ctx;
 	}
 
-	ctx->id = ida_alloc(&mdp->mdp_ida, GFP_KERNEL);
+	ret = ida_alloc(&mdp->mdp_ida, GFP_KERNEL);
+	if (ret < 0)
+		goto err_unlock_mutex;
+	ctx->id = ret;
+
 	ctx->mdp_dev = mdp;
 
 	v4l2_fh_init(&ctx->fh, vdev);
@@ -617,6 +621,8 @@ static int mdp_m2m_open(struct file *file)
 	v4l2_fh_del(&ctx->fh);
 err_exit_fh:
 	v4l2_fh_exit(&ctx->fh);
+	ida_free(&mdp->mdp_ida, ctx->id);
+err_unlock_mutex:
 	mutex_unlock(&mdp->m2m_lock);
 err_free_ctx:
 	kfree(ctx);



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