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Code Issues Releases Activity

avutil: Add av_image_check_size2()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit f542b152aa2086b30d1089162d79f5c136905c0c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-12-10 21:05:14 +01:00
parent 7dd1cc6076
commit 76961f4f42
2 changed files with 38 additions and 5 deletions
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29
libavutil/imgutils.c
View File

@ -248,19 +248,38 @@ static const AVClass imgutils_class = {
.parent_log_context_offset = offsetof(ImgUtils, log_ctx), .parent_log_context_offset = offsetof(ImgUtils, log_ctx),
}; };
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx) int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx)
{ {
ImgUtils imgutils = { ImgUtils imgutils = {
.class = &imgutils_class, .class = &imgutils_class,
.log_offset = log_offset, .log_offset = log_offset,
.log_ctx = log_ctx, .log_ctx = log_ctx,
}; };
int64_t stride = av_image_get_linesize(pix_fmt, w, 0);
if (stride <= 0)
stride = 8LL*w;
stride += 128*8;
if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8) if ((int)w<=0 || (int)h<=0 || stride >= INT_MAX || stride*(uint64_t)(h+128) >= INT_MAX) {
return 0; av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
return AVERROR(EINVAL);
}
av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h); if (max_pixels < INT64_MAX) {
return AVERROR(EINVAL); if (w*(int64_t)h > max_pixels) {
av_log(&imgutils, AV_LOG_ERROR,
"Picture size %ux%u exceeds specified max pixel count %"PRId64", see the documentation if you wish to increase it\n",
w, h, max_pixels);
return AVERROR(EINVAL);
}
}
return 0;
}
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
{
return av_image_check_size2(w, h, INT64_MAX, AV_PIX_FMT_NONE, log_offset, log_ctx);
} }
int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar) int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)

14
libavutil/imgutils.h
View File

@ -191,6 +191,20 @@ int av_image_copy_to_buffer(uint8_t *dst, int dst_size,
*/ */
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx); int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx);
/**
* Check if the given dimension of an image is valid, meaning that all
* bytes of the image can be addressed with a signed int.
*
* @param w the width of the picture
* @param h the height of the picture
* @param max_pixels the maximum number of pixels the user wants to accept
* @param pix_fmt the pixel format, can be AV_PIX_FMT_NONE if unknown.
* @param log_offset the offset to sum to the log level for logging with log_ctx
* @param log_ctx the parent logging context, it may be NULL
* @return >= 0 if valid, a negative error code otherwise
*/
int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx);
/** /**
* Check if the given sample aspect ratio of an image is valid. * Check if the given sample aspect ratio of an image is valid.
* *