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

kernel test robot
2023-03-28T17:45:31Z

config: s390-randconfig-r044-20230327 (https://download.01.org/0day-ci/archive/20230329/202303290153.AP9Oe2GL-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# 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=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/media/platform/mediatek/vcodec/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303290153.AP9Oe2GL-lkp@intel.com/

All warnings (new ones prefixed by >>):

In file included from drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c:9:
In file included from include/media/v4l2-mem2mem.h:16:
In file included from include/media/videobuf2-v4l2.h:16:
In file included from include/media/videobuf2-core.h:18:
In file included from include/linux/dma-buf.h:16:
In file included from include/linux/iosys-map.h:10:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c:9:
In file included from include/media/v4l2-mem2mem.h:16:
In file included from include/media/videobuf2-v4l2.h:16:
In file included from include/media/videobuf2-core.h:18:
In file included from include/linux/dma-buf.h:16:
In file included from include/linux/iosys-map.h:10:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c:9:
In file included from include/media/v4l2-mem2mem.h:16:
In file included from include/media/videobuf2-v4l2.h:16:
In file included from include/media/videobuf2-core.h:18:
In file included from include/linux/dma-buf.h:16:
In file included from include/linux/iosys-map.h:10:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c:759:3: warning: add explicit braces to avoid dangling else [-Wdangling-else]
else
^
13 warnings generated.

vim +759 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