libavcodec/bink.c:245: error: Integer Overflow L2
  ([1, +oo] - 4):unsigned32 by call to `bitstream_read`.

libavcodec/bink.c:245:21: Call
243.     int i, t, len;
244. 
245.     tree->vlc_num = bitstream_read(bc, 4);
                         ^
246.     if (!tree->vlc_num) {
247.         for (i = 0; i < 16; i++)

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;
}
['static void read_tree(BitstreamContext *bc, Tree *tree)\n{\n    uint8_t tmp1[16] = { 0 }, tmp2[16], *in = tmp1, *out = tmp2;\n    int i, t, len;\n    tree->vlc_num = bitstream_read(bc, 4);\n    if (!tree->vlc_num) {\n        for (i = 0; i < 16; i++)\n            tree->syms[i] = i;\n        return;\n    }\n    if (bitstream_read_bit(bc)) {\n        len = bitstream_read(bc, 3);\n        for (i = 0; i <= len; i++) {\n            tree->syms[i] = bitstream_read(bc, 4);\n            tmp1[tree->syms[i]] = 1;\n        }\n        for (i = 0; i < 16 && len < 16 - 1; i++)\n            if (!tmp1[i])\n                tree->syms[++len] = i;\n    } else {\n        len = bitstream_read(bc, 2);\n        for (i = 0; i < 16; i++)\n            in[i] = i;\n        for (i = 0; i <= len; i++) {\n            int size = 1 << i;\n            for (t = 0; t < 16; t += size << 1)\n                merge(bc, out + t, in + t, size);\n            FFSWAP(uint8_t*, in, out);\n        }\n        memcpy(tree->syms, in, 16);\n    }\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}']