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fftools/ffmpeg: avoid possible invalid reads with short -tag values

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Fixes #10319 and #10309.

Based on 89c9a3ac3542c3684e511607d88b265bfa6aa64f.
This commit is contained in:
Anton Khirnov 2023-04-13 15:56:54 +02:00
parent c36f69d7e3
commit 1e413487bf
1 changed files with 10 additions and 4 deletions
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14
fftools/ffmpeg_opt.c
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@ -898,8 +898,11 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, ic, st); MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, ic, st);
if (codec_tag) { if (codec_tag) {
uint32_t tag = strtol(codec_tag, &next, 0); uint32_t tag = strtol(codec_tag, &next, 0);
if (*next) if (*next) {
tag = AV_RL32(codec_tag); uint8_t buf[4] = { 0 };
memcpy(buf, codec_tag, FFMIN(sizeof(buf), strlen(codec_tag)));
tag = AV_RL32(buf);
}
st->codecpar->codec_tag = tag; st->codecpar->codec_tag = tag;
} }
@ -1660,8 +1663,11 @@ static OutputStream *new_output_stream(OptionsContext *o, AVFormatContext *oc, e
MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, oc, st); MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, oc, st);
if (codec_tag) { if (codec_tag) {
uint32_t tag = strtol(codec_tag, &next, 0); uint32_t tag = strtol(codec_tag, &next, 0);
if (*next) if (*next) {
tag = AV_RL32(codec_tag); uint8_t buf[4] = { 0 };
memcpy(buf, codec_tag, FFMIN(sizeof(buf), strlen(codec_tag)));
tag = AV_RL32(buf);
}
ost->st->codecpar->codec_tag = ost->st->codecpar->codec_tag =
ost->enc_ctx->codec_tag = tag; ost->enc_ctx->codec_tag = tag;
} }