[PATCH] media: mediatek: vcodec: Fix potential array out-of-bounds in decoder queue_setup

[kernel test robot]

Hi Wei,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on media-tree/master]
[also build test WARNING on linus/master v6.3-rc4 next-20230328]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Wei-Chen/media-mediatek-vcodec-Fix-potential-array-out-of-bounds-in-decoder-queue_setup/20230328-181142
base:   git://linuxtv.org/media_tree.git master
patch link:    https://lore.kernel.org/r/20230328100951.536955-1-harperchen1110%40gmail.com
patch subject: [PATCH] media: mediatek: vcodec: Fix potential array out-of-bounds in decoder queue_setup
config: riscv-allmodconfig (https://download.01.org/0day-ci/archive/20230328/202303282152.CXxK3RNH-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/caa43627286fb5f3b0b3af7e01e1baeca5c5f9cc
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Wei-Chen/media-mediatek-vcodec-Fix-potential-array-out-of-bounds-in-decoder-queue_setup/20230328-181142
        git checkout caa43627286fb5f3b0b3af7e01e1baeca5c5f9cc
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/media/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303282152.CXxK3RNH-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c: In function 'vb2ops_vdec_queue_setup':
>> drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c:756:20: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
     756 |                 if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
         |                    ^


vim +/else +756 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c

   739	
   740	int vb2ops_vdec_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
   741				    unsigned int *nplanes, unsigned int sizes[],
   742				    struct device *alloc_devs[])
   743	{
   744		struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vq);
   745		struct mtk_q_data *q_data;
   746		unsigned int i;
   747	
   748		q_data = mtk_vdec_get_q_data(ctx, vq->type);
   749	
   750		if (q_data == NULL) {
   751			mtk_v4l2_err("vq->type=%d err\n", vq->type);
   752			return -EINVAL;
   753		}
   754	
   755		if (*nplanes) {
 > 756			if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
   757				if (*nplanes != q_data->fmt->num_planes)
   758					return -EINVAL;
   759			else
   760				if (*nplanes != 1)
   761					return -EINVAL;
   762	
   763			for (i = 0; i < *nplanes; i++) {
   764				if (sizes[i] < q_data->sizeimage[i])
   765					return -EINVAL;
   766			}
   767		} else {
   768			if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
   769				*nplanes = q_data->fmt->num_planes;
   770			else
   771				*nplanes = 1;
   772	
   773			for (i = 0; i < *nplanes; i++)
   774				sizes[i] = q_data->sizeimage[i];
   775		}
   776	
   777		mtk_v4l2_debug(1,
   778				"[%d]\t type = %d, get %d plane(s), %d buffer(s) of size 0x%x 0x%x ",
   779				ctx->id, vq->type, *nplanes, *nbuffers,
   780				sizes[0], sizes[1]);
   781	
   782		return 0;
   783	}
   784	

-- 
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