From 'man ppm': The maximum color value (Maxval), again in ASCII decimal.
Must be less than 65536.
Signed-off-by: Andreas Cadhalpun <andreas.cadhal...@googlemail.com>
---
libavcodec/pnm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavcodec/pnm.c b/libavcodec/pnm.c
index 1675959..4753923 100644
--- a/libavcodec/pnm.c
+++ b/libavcodec/pnm.c
@@ -107,7 +107,8 @@ int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext
* const s)
}
}
/* check that all tags are present */
- if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] ==
'\0' || av_image_check_size(w, h, 0, avctx) || s->bytestream >=
s->bytestream_end)
+ if (w <= 0 || h <= 0 || maxval <= 0 || maxval > UINT16_MAX || depth <=
0 || tuple_type[0] == '\0' ||
+ av_image_check_size(w, h, 0, avctx) || s->bytestream >=
s->bytestream_end)
return AVERROR_INVALIDDATA;
avctx->width = w;
@@ -159,7 +160,7 @@ int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext
* const s)
if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt !=
AV_PIX_FMT_MONOBLACK) {
pnm_get(s, buf1, sizeof(buf1));
s->maxval = atoi(buf1);
- if (s->maxval <= 0) {
+ if (s->maxval <= 0 || s->maxval > UINT16_MAX) {
av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
s->maxval = 255;
}
--
2.10.2
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