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jpegls: check the scan offset
Prevent an out of array bound write. Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind CC: libav-stable@libav.org
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@ -306,6 +306,10 @@ int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
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av_dlog(s->avctx, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
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ilv, point_transform, s->bits, s->cur_scan);
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if (ilv == 0) { /* separate planes */
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if (s->cur_scan > s->nb_components) {
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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off = s->cur_scan - 1;
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stride = (s->nb_components > 1) ? 3 : 1;
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width = s->width * stride;
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