On Fri, 9 Dec 2016, Michael Niedermayer wrote:
Adds av_image_check_size2() with max_pixels and pix_fmt parameters.
pix_fmt is unused and is added to avoid a 2nd API change later
The old function uses AVOptions to obtain the max_pixels value to simplify
the transition.
TODO: split into 2 patches (one per lib), docs & bump
This allows preventing some OOM and "slow decoding" cases by limiting the
maximum resolution
this may be useful to avoid fuzzers getting stuck in boring cases
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
libavcodec/avcodec.h | 8 ++++++++
libavcodec/options_table.h | 1 +
libavutil/imgutils.c | 31 ++++++++++++++++++++++++++-----
libavutil/imgutils.h | 14 ++++++++++++++
tests/ref/fate/api-mjpeg-codec-param | 2 ++
tests/ref/fate/api-png-codec-param | 2 ++
6 files changed, 53 insertions(+), 5 deletions(-)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 7ac2adaf66..81052b10ef 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -3570,6 +3570,14 @@ typedef struct AVCodecContext {
*/
int trailing_padding;
+ /**
+ * The number of pixels per image to maximally accept.
+ *
+ * - decoding: set by user
+ * - encoding: unused
+ */
+ int max_pixels;
Don't we want to make this an int64, for future extendability?
+
} AVCodecContext;
AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
diff --git a/libavcodec/options_table.h b/libavcodec/options_table.h
index ee79859953..2f5eb252fe 100644
--- a/libavcodec/options_table.h
+++ b/libavcodec/options_table.h
@@ -570,6 +570,7 @@ static const AVOption avcodec_options[] = {
{"codec_whitelist", "List of decoders that are allowed to be used",
OFFSET(codec_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, A|V|S|D },
{"pixel_format", "set pixel format", OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT,
{.i64=AV_PIX_FMT_NONE}, -1, INT_MAX, 0 },
{"video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE,
{.str=NULL}, 0, INT_MAX, 0 },
+{"max_pixels", "Maximum number of pixels", OFFSET(max_pixels),
AV_OPT_TYPE_INT, {.i64 = INT_MAX }, 0, INT_MAX, A|V|S|D },
INT_MAX is probably OK, as who knows what will crash for bigger sizes,
right?
Thanks,
Marton
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