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From 19cd6fe85610b424349db2d97e2dd0e2761a4a05 Mon Sep 17 00:00:00 2001
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From: Frediano Ziglio <freddy77@gmail.com>
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Date: Wed, 29 Apr 2020 15:10:24 +0100
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Subject: [PATCH spice-common 2/4] quic: Check image size in quic_decode_begin
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Avoid some overflow in code due to images too big or
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negative numbers.
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Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
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Acked-by: Uri Lublin <uril@redhat.com>
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---
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common/quic.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/spice-common/common/quic.c b/spice-common/common/quic.c
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index e03f3af..890f128 100644
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--- a/spice-common/common/quic.c
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+++ b/spice-common/common/quic.c
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@@ -56,6 +56,9 @@ typedef uint8_t BYTE;
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#define MINwminext 1
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#define MAXwminext 100000000
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+/* Maximum image size in pixels, mainly to avoid possible integer overflows */
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+#define SPICE_MAX_IMAGE_SIZE (512 * 1024 * 1024 - 1)
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+
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typedef struct QuicFamily {
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unsigned int nGRcodewords[MAXNUMCODES]; /* indexed by code number, contains number of
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unmodified GR codewords in the code */
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@@ -1165,6 +1168,16 @@ int quic_decode_begin(QuicContext *quic, uint32_t *io_ptr, unsigned int num_io_w
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height = encoder->io_word;
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decode_eat32bits(encoder);
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+ if (width <= 0 || height <= 0) {
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+ encoder->usr->warn(encoder->usr, "invalid size\n");
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+ return QUIC_ERROR;
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+ }
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+
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+ /* avoid too big images */
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+ if ((uint64_t) width * height > SPICE_MAX_IMAGE_SIZE) {
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+ encoder->usr->error(encoder->usr, "image too large\n");
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+ }
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+
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quic_image_params(encoder, type, &channels, &bpc;;
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if (!encoder_reset_channels(encoder, channels, width, bpc)) {
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--
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2.25.4
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