[FFmpeg-devel] [PATCH 1/2] avcodec/vvcdec: filter, fix uninitialized variables for YUV400 format

[Nuo Mi]

On Sat, Aug 31, 2024 at 2:36 PM Nuo Mi <nuomi2021 at gmail.com> wrote:

>
>
> On Fri, Aug 23, 2024 at 11:04 PM Nuo Mi <nuomi2021 at gmail.com> wrote:
>
>> fix
>> ==135000== Conditional jump or move depends on uninitialised value(s)
>> ==135000==    at 0x169FF95: vvc_deblock_bs (filter.c:699)
>> and
>> ==135000== Conditional jump or move depends on uninitialised value(s)
>> ==135000==    at 0x16A2E72: ff_vvc_alf_filter (filter.c:1217)
>>
>> Reported-by: James Almer <jamrial at gmail.com>
>>
> Applied. I will monitor the next result from
> https://fate.ffmpeg.org/report.cgi?time=20240821174441&slot=x86_64-archlinux-gcc-valgrind
> .
>
Fixed.
https://fate.ffmpeg.org/report.cgi?slot=x86_64-archlinux-gcc-valgrind&time=20240901001853


> Thank you, James, for the report
>
>> ---
>>  libavcodec/vvc/filter.c | 6 ++++--
>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/libavcodec/vvc/filter.c b/libavcodec/vvc/filter.c
>> index c96e59df89..aa0d542271 100644
>> --- a/libavcodec/vvc/filter.c
>> +++ b/libavcodec/vvc/filter.c
>> @@ -686,11 +686,12 @@ static void vvc_deblock_bs(const VVCLocalContext
>> *lc, const int x0, const int y0
>>      const int ctb_size = sps->ctb_size_y;
>>      const int x_end    = FFMIN(x0 + ctb_size, pps->width) >> MIN_TU_LOG2;
>>      const int y_end    = FFMIN(y0 + ctb_size, pps->height) >>
>> MIN_TU_LOG2;
>> +    const int has_chroma       = !!sps->r->sps_chroma_format_idc;
>>      deblock_bs_fn deblock_bs[] = {
>>          vvc_deblock_bs_luma, vvc_deblock_bs_chroma
>>      };
>>
>> -    for (int is_chroma = 0; is_chroma <= 1; is_chroma++) {
>> +    for (int is_chroma = 0; is_chroma <= has_chroma; is_chroma++) {
>>          const int hs = sps->hshift[is_chroma];
>>          const int vs = sps->vshift[is_chroma];
>>          for (int y = y0 >> MIN_TU_LOG2; y < y_end; y++) {
>> @@ -1194,6 +1195,7 @@ void ff_vvc_alf_filter(VVCLocalContext *lc, const
>> int x0, const int y0)
>>      const int padded_stride = EDGE_EMU_BUFFER_STRIDE << ps;
>>      const int padded_offset = padded_stride * ALF_PADDING_SIZE +
>> (ALF_PADDING_SIZE << ps);
>>      const int c_end         = sps->r->sps_chroma_format_idc ?
>> VVC_MAX_SAMPLE_ARRAYS : 1;
>> +    const int has_chroma    = !!sps->r->sps_chroma_format_idc;
>>      const int ctu_end       = y0 + sps->ctb_size_y;
>>      const ALFParams *alf    = &CTB(fc->tab.alf, rx, ry);
>>      int sb_edges[MAX_VBBS][MAX_EDGES], nb_sbs;
>> @@ -1214,7 +1216,7 @@ void ff_vvc_alf_filter(VVCLocalContext *lc, const
>> int x0, const int y0)
>>              uint8_t *src         = POS(c_idx, sb->l, sb->t);
>>              uint8_t *padded;
>>
>> -            if (alf->ctb_flag[c_idx] || (!c_idx && (alf->ctb_cc_idc[0]
>> || alf->ctb_cc_idc[1]))) {
>> +            if (alf->ctb_flag[c_idx] || (!c_idx && has_chroma &&
>> (alf->ctb_cc_idc[0] || alf->ctb_cc_idc[1]))) {
>>                  padded = (c_idx ? lc->alf_buffer_chroma :
>> lc->alf_buffer_luma) + padded_offset;
>>                  alf_prepare_buffer(fc, padded, src, x, y, rx, ry, width,
>> height,
>>                      padded_stride, src_stride, c_idx, sb_edges[i]);
>> --
>> 2.34.1
>>
>>