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libswresample/swresamplec: Err num(negative-size) was used as a function parameter 

If memory allocation fails, ERROR(ENOMEM) '-12' will be returned.
When resample() is done first, the negative size param would cause buffer-overflow and SEGV in swri_rematrix().
When swri_rematrix() is run first, resample() would not cause an error but Err num as a wrong parameter passing.
Err num should be returned immediately. And remove an unneeded term from an assert.

coredump info:
    #0 0x499517 in posix_memalign (/home/r1/ffmpeg/ffmpeg_4.4.1+0x499517)
    #1 0x6c1f0b4 in av_malloc /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavutil/mem.c:86:9
    #2 0x6c208fe in av_mallocz /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavutil/mem.c:239:17
    #3 0x6c207ad in av_mallocz_array /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavutil/mem.c:195:12
    #4 0x654b2e5 in swri_realloc_audio /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libswresample/swresample.c:418:14
    #5 0x654f9a1 in swr_convert_internal /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libswresample/swresample.c:601:17
    #6 0x654d2c0 in swr_convert /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libswresample/swresample.c:766:19
    #7 0x186cf56 in flush_frame /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/af_aresample.c:251:13
    #8 0x186a454 in request_frame /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/af_aresample.c:288:20
    #9 0x787d9c in ff_request_frame_to_filter /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/avfilter.c:459:15
    #10 0x7877f1 in forward_status_change /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/avfilter.c:1257:19
    #11 0x77ed7e in ff_filter_activate_default /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/avfilter.c:1288:20
    #12 0x77e4e1 in ff_filter_activate /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/avfilter.c:1441:11
    #13 0x793b3f in ff_filter_graph_run_once /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/avfiltergraph.c:1403:12
    #14 0x7a7bee in get_frame_internal /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/buffersink.c:131:19
    #15 0x7a7287 in av_buffersink_get_frame_flags /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/buffersink.c:142:12
    #16 0x792888 in avfilter_graph_request_oldest /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/libavfilter/avfiltergraph.c:1356:17
    #17 0x5d07df in transcode_from_filter /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/fftools/ffmpeg.c:4639:11
    #18 0x59e557 in transcode_step /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/fftools/ffmpeg.c:4729:20
    #19 0x593970 in transcode /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/fftools/ffmpeg.c:4805:15
    #20 0x58f7a4 in main /home/r1/ffmpeg/ffmpeg-4.4.1/build/src/fftools/ffmpeg.c:5010:9
    #21 0x7f6fd2dee0b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16

SUMMARY: AddressSanitizer: negative-size-param (/home/r1/ffmpeg/ffmpeg_4.4.1+0x497e67) in __asan_memcpy

Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Yu Yang 2021-12-08 11:17:13 +08:00 committed by Michael Niedermayer
parent 408b974796
commit ac2b34abbf
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
libswresample/swresample.c
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@ -643,14 +643,16 @@ static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_co
if(s->resample_first){ if(s->resample_first){
if(postin != midbuf) if(postin != midbuf)
out_count= resample(s, midbuf, out_count, postin, in_count); if ((out_count = resample(s, midbuf, out_count, postin, in_count)) < 0)
return out_count;
if(midbuf != preout) if(midbuf != preout)
swri_rematrix(s, preout, midbuf, out_count, preout==out); swri_rematrix(s, preout, midbuf, out_count, preout==out);
}else{ }else{
if(postin != midbuf) if(postin != midbuf)
swri_rematrix(s, midbuf, postin, in_count, midbuf==out); swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
if(midbuf != preout) if(midbuf != preout)
out_count= resample(s, preout, out_count, midbuf, in_count); if ((out_count = resample(s, preout, out_count, midbuf, in_count)) < 0)
return out_count;
} }
if(preout != out && out_count){ if(preout != out && out_count){
@ -769,7 +771,7 @@ int attribute_align_arg swr_convert(struct SwrContext *s,
if(ret>0 && !s->drop_output) if(ret>0 && !s->drop_output)
s->outpts += ret * (int64_t)s->in_sample_rate; s->outpts += ret * (int64_t)s->in_sample_rate;
av_assert2(max_output < 0 || ret < 0 || ret <= max_output); av_assert2(max_output < 0 || ret <= max_output);
return ret; return ret;
}else{ }else{