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fftools/ffmpeg_filter: fix NULL pointer dereference 

In close_output(), a dummy frame is created with format NONE passed
to enc_open(), which isn't prepared for it. The NULL pointer
dereference happened at
av_pix_fmt_desc_get(enc_ctx->pix_fmt)->comp[0].depth.

When fgt.graph is NULL, skip fg_output_frame() since there is
nothing to output.

frame #0: 0x0000005555bc34a4 ffmpeg_g`enc_open(opaque=0xb400007efe2db690, frame=0xb400007efe2d9f70) at ffmpeg_enc.c:235:44
frame #1: 0x0000005555bef250 ffmpeg_g`enc_open(sch=0xb400007dde2d4090, enc=0xb400007e4e2daad0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:1462:11
frame #2: 0x0000005555bee094 ffmpeg_g`send_to_enc(sch=0xb400007dde2d4090, enc=0xb400007e4e2daad0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:1571:19
frame #3: 0x0000005555bee01c ffmpeg_g`sch_filter_send(sch=0xb400007dde2d4090, fg_idx=0, out_idx=0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:2154:12
frame #4: 0x0000005555bcf124 ffmpeg_g`close_output(ofp=0xb400007e4e2d85b0, fgt=0x0000007d1790eb08) at ffmpeg_filter.c:2225:15
frame #5: 0x0000005555bcb000 ffmpeg_g`fg_output_frame(ofp=0xb400007e4e2d85b0, fgt=0x0000007d1790eb08, frame=0x0000000000000000) at ffmpeg_filter.c:2317:16
frame #6: 0x0000005555bc7e48 ffmpeg_g`filter_thread(arg=0xb400007eae2ce7a0) at ffmpeg_filter.c:2836:15
frame #7: 0x0000005555bee568 ffmpeg_g`task_wrapper(arg=0xb400007d8e2db478) at ffmpeg_sched.c:2200:21

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
This commit is contained in:
Zhao Zhili 2023-12-20 18:26:22 +08:00
parent 5c3d2177e7
commit 7cd416792a
1 changed files with 1 additions and 1 deletions
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2
fftools/ffmpeg_filter.c
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@ -2835,7 +2835,7 @@ read_frames:
for (unsigned i = 0; i < fg->nb_outputs; i++) { for (unsigned i = 0; i < fg->nb_outputs; i++) {
OutputFilterPriv *ofp = ofp_from_ofilter(fg->outputs[i]); OutputFilterPriv *ofp = ofp_from_ofilter(fg->outputs[i]);
if (fgt.eof_out[i]) if (fgt.eof_out[i] || !fgt.graph)
continue; continue;
ret = fg_output_frame(ofp, &fgt, NULL); ret = fg_output_frame(ofp, &fgt, NULL);