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diff --git a/common/quic.c b/common/quic.c
index bc753ca5064a0326906b4aa8c18d8745747feb5c..681531677fbd6c3bca5e482c77bb709d4465ef8e 100644
--- a/subprojects/spice-common/common/quic.c
+++ b/subprojects/spice-common/common/quic.c
@@ -56,6 +56,9 @@ typedef uint8_t BYTE;
#define MINwminext 1
#define MAXwminext 100000000
+/* Maximum image size in pixels, mainly to avoid possible integer overflows */
+#define SPICE_MAX_IMAGE_SIZE (512 * 1024 * 1024 - 1)
+
typedef struct QuicFamily {
unsigned int nGRcodewords[MAXNUMCODES]; /* indexed by code number, contains number of
unmodified GR codewords in the code */
@@ -1165,6 +1168,16 @@ int quic_decode_begin(QuicContext *quic, uint32_t *io_ptr, unsigned int num_io_w
height = encoder->io_word;
decode_eat32bits(encoder);
+ if (width <= 0 || height <= 0) {
+ encoder->usr->warn(encoder->usr, "invalid size\n");
+ return QUIC_ERROR;
+ }
+
+ /* avoid too big images */
+ if ((uint64_t) width * height > SPICE_MAX_IMAGE_SIZE) {
+ encoder->usr->error(encoder->usr, "image too large\n");
+ }
+
quic_image_params(encoder, type, &channels, &bpc);
if (!encoder_reset_channels(encoder, channels, width, bpc)) {
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