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| author | Jiasheng Jiang <jiasheng@iscas.ac.cn> | 2023-02-09 16:52:45 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2023-03-20 00:53:47 +0300 |
| commit | d00f592250782538cda87745607695b0fe27dcd4 (patch) | |
| tree | 04343432f8bbfc8e29aed8b1f9ed5c181416d07c /drivers | |
| parent | 35dac920f721ccfed1116e807b90d8971db3d457 (diff) | |
| download | linux-d00f592250782538cda87745607695b0fe27dcd4.tar.xz | |
media: platform: mtk-mdp3: Add missing check and free for ida_alloc
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@iscas.ac.cn>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c index 5f74ea3b7a52..8612a48bde10 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 @@ err_release_handler: 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); |