#8496: Conditional jump or move depends on uninitialised value with small input --------------------------------------+--------------------------------- Reporter: ubitux | Owner: Type: defect | Status: new Priority: important | Component: swscale Version: git-master | Keywords: Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 --------------------------------------+--------------------------------- {{{ ☭ valgrind ./ffmpeg_g -f lavfi -i color=white:s=2x2,format=rgba,scale=10x10 -frames:v 1 -f null - ==95117== Memcheck, a memory error detector ==95117== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==95117== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info ==95117== Command: ./ffmpeg_g -f lavfi -i color=white:s=2x2,format=rgba,scale=10x10 -frames:v 1 -f null - ==95117== ffmpeg version N-96482-ge931119a41 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9.2.0 (GCC) configuration: --cc=/usr/bin/gcc libavutil 56. 38.100 / 56. 38.100 libavcodec 58. 66.100 / 58. 66.100 libavformat 58. 35.104 / 58. 35.104 libavdevice 58. 9.103 / 58. 9.103 libavfilter 7. 71.100 / 7. 71.100 libswscale 5. 6.100 / 5. 6.100 libswresample 3. 6.100 / 3. 6.100 ==95117== Conditional jump or move depends on uninitialised value(s) ==95117== at 0xF25462: yuv2rgb_full_1_c_template (output.c:2102) ==95117== by 0xF25462: yuv2rgba32_full_1_c (output.c:2142) ==95117== by 0xF05B31: packed_vscale (vscale.c:134) ==95117== by 0xF01D20: swscale (swscale.c:503) ==95117== by 0xF02D5C: sws_scale (swscale.c:978) ==95117== by 0x3A5496: scale_slice.isra.0 (vf_scale.c:647) ==95117== by 0x3A5C76: scale_frame (vf_scale.c:809) ==95117== by 0x3A5D77: filter_frame (vf_scale.c:823) ==95117== by 0x2C85FC: ff_filter_frame_framed (avfilter.c:1066) ==95117== by 0x2C85FC: ff_filter_frame_to_filter (avfilter.c:1214) ==95117== by 0x2C85FC: ff_filter_activate_default (avfilter.c:1263) ==95117== by 0x2C85FC: ff_filter_activate (avfilter.c:1425) ==95117== by 0x2CBC1C: get_frame_internal (buffersink.c:108) ==95117== by 0x2A6917: lavfi_read_packet (lavfi.c:412) ==95117== by 0x5AEB2E: ff_read_packet (utils.c:857) ==95117== by 0x5AF4AA: read_frame_internal (utils.c:1588) ==95117== Input #0, lavfi, from 'color=white:s=2x2,format=rgba,scale=10x10': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: rawvideo (RGBA / 0x41424752), rgba, 10x10 [SAR 1:1 DAR 1:1], 25 tbr, 25 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: encoder : Lavf58.35.104 Stream #0:0: Video: wrapped_avframe, rgba, 10x10 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc58.66.100 wrapped_avframe frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.113x video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown ==95117== ==95117== HEAP SUMMARY: ==95117== in use at exit: 0 bytes in 0 blocks ==95117== total heap usage: 2,725 allocs, 2,725 frees, 926,979 bytes allocated ==95117== ==95117== All heap blocks were freed -- no leaks are possible ==95117== ==95117== Use --track-origins=yes to see where uninitialised values come from ==95117== For lists of detected and suppressed errors, rerun with: -s ==95117== ERROR SUMMARY: 100 errors from 1 contexts (suppressed: 0 from 0) }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/8496> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker