libavcodec/ivi.c:244: error: Integer Overflow L2
  ([1, +oo] - 4):unsigned32 by call to `bitstream_read`.

libavcodec/ivi.c:244:29: Call
242.     if (huff_tab->tab_sel == 7) {
243.         /* custom huffman table (explicitly encoded) */
244.         new_huff.num_rows = bitstream_read(bc, 4);
                                 ^
245.         if (!new_huff.num_rows) {
246.             av_log(avctx, AV_LOG_ERROR, "Empty custom Huffman table!\n");

libavcodec/bitstream.h:183:1: Parameter `n`
  181. 
  182. /* Return n bits from the buffer. n has to be in the 0-32 range. */
  183. static inline uint32_t bitstream_read(BitstreamContext *bc, unsigned n)
       ^
  184. {
  185.     if (!n)

libavcodec/bitstream.h:194:12: Call
  192.     }
  193. 
  194.     return get_val(bc, n);
                  ^
  195. }
  196. 

libavcodec/bitstream.h:130:1: <LHS trace>
128. }
129. 
130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
     ^
131. {
132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: Parameter `bc->bits_left`
    128. }
    129. 
    130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
         ^
    131. {
    132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: <RHS trace>
128. }
129. 
130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
     ^
131. {
132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: Parameter `n`
    128. }
    129. 
    130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
         ^
    131. {
    132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:139:5: Binary operation: ([1, +oo] - 4):unsigned32 by call to `bitstream_read` 
    137.     bc->bits <<= n;
    138. #endif
    139.     bc->bits_left -= n;
             ^
    140. 
    141.     return ret;

static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
{
#ifdef BITSTREAM_READER_LE
    uint64_t ret = bc->bits & ((UINT64_C(1) << n) - 1);
    bc->bits >>= n;
#else
    uint64_t ret = bc->bits >> (64 - n);
    bc->bits <<= n;
#endif
    bc->bits_left -= n;
    return ret;
}
['int ff_ivi_dec_huff_desc(BitstreamContext *bc, int desc_coded, int which_tab,\n                         IVIHuffTab *huff_tab, AVCodecContext *avctx)\n{\n    int i, result;\n    IVIHuffDesc new_huff;\n    if (!desc_coded) {\n        huff_tab->tab = (which_tab) ? &ivi_blk_vlc_tabs[7]\n                                    : &ivi_mb_vlc_tabs [7];\n        return 0;\n    }\n    huff_tab->tab_sel = bitstream_read(bc, 3);\n    if (huff_tab->tab_sel == 7) {\n        new_huff.num_rows = bitstream_read(bc, 4);\n        if (!new_huff.num_rows) {\n            av_log(avctx, AV_LOG_ERROR, "Empty custom Huffman table!\\n");\n            return AVERROR_INVALIDDATA;\n        }\n        for (i = 0; i < new_huff.num_rows; i++)\n            new_huff.xbits[i] = bitstream_read(bc, 4);\n        if (ivi_huff_desc_cmp(&new_huff, &huff_tab->cust_desc)) {\n            ivi_huff_desc_copy(&huff_tab->cust_desc, &new_huff);\n            if (huff_tab->cust_tab.table)\n                ff_free_vlc(&huff_tab->cust_tab);\n            result = ivi_create_huff_from_desc(&huff_tab->cust_desc,\n                    &huff_tab->cust_tab, 0);\n            if (result) {\n                huff_tab->cust_desc.num_rows = 0;\n                av_log(avctx, AV_LOG_ERROR,\n                       "Error while initializing custom vlc table!\\n");\n                return result;\n            }\n        }\n        huff_tab->tab = &huff_tab->cust_tab;\n    } else {\n        huff_tab->tab = (which_tab) ? &ivi_blk_vlc_tabs[huff_tab->tab_sel]\n            : &ivi_mb_vlc_tabs [huff_tab->tab_sel];\n    }\n    return 0;\n}', 'static inline uint32_t bitstream_read(BitstreamContext *bc, unsigned n)\n{\n    if (!n)\n        return 0;\n    if (n > bc->bits_left) {\n        refill_32(bc);\n        if (bc->bits_left < 32)\n            bc->bits_left = n;\n    }\n    return get_val(bc, n);\n}', 'static inline uint64_t get_val(BitstreamContext *bc, unsigned n)\n{\n#ifdef BITSTREAM_READER_LE\n    uint64_t ret = bc->bits & ((UINT64_C(1) << n) - 1);\n    bc->bits >>= n;\n#else\n    uint64_t ret = bc->bits >> (64 - n);\n    bc->bits <<= n;\n#endif\n    bc->bits_left -= n;\n    return ret;\n}']