> On Jul 31, 2025, at 10:13, Cai Fan <[email protected]> wrote:
>
> Signed-off-by: Cai Fan <[email protected]>
> ---
> libavformat/img2enc.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/libavformat/img2enc.c b/libavformat/img2enc.c
> index 41638d92b8..a1eb0c688d 100644
> --- a/libavformat/img2enc.c
> +++ b/libavformat/img2enc.c
> @@ -180,7 +180,12 @@ static int write_packet(AVFormatContext *s, AVPacket
> *pkt)
> }
> for (i = 0; i < 4; i++) {
> av_dict_copy(&options, img->protocol_opts, 0);
> - snprintf(img->tmp[i], sizeof(img->tmp[i]), "%s.tmp", filename);
> + int len = snprintf(img->tmp[i], sizeof(img->tmp[i]), "%s.tmp",
> filename);
> + if (len < 0 || len >= sizeof(img->tmp[i])) {
> + av_log(s, AV_LOG_ERROR, "Filename too long: %s\n", filename);
“filename exceeds buffer size %zu\n”.
> + ret = AVERROR(EINVAL);
> + goto fail;
> + }
> av_strlcpy(img->target[i], filename, sizeof(img->target[i]));
> if (s->io_open(s, &pb[i], img->use_rename ? img->tmp[i] : filename,
> AVIO_FLAG_WRITE, &options) < 0) {
> av_log(s, AV_LOG_ERROR, "Could not open file : %s\n",
> img->use_rename ? img->tmp[i] : filename);
> --
> 2.34.1
>
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