[PATCH spice-common v3] lz: Avoid buffer reading overflow checking for image type

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

The type of the image is just copied from network without
any check and later used for array indexing.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 common/lz.c | 3 +++
 1 file changed, 3 insertions(+)

Changes since v3:
- just fix the issue, without changing much the code/declarations

diff --git a/common/lz.c b/common/lz.c
index b7e7d48..ff5f4ef 100644
--- a/common/lz.c
+++ b/common/lz.c
@@ -594,6 +594,9 @@ void lz_decode_begin(LzContext *lz, uint8_t *io_ptr, unsigned int num_io_bytes,
     }
 
     encoder->type = (LzImageType)decode_32(encoder);
+    if (encoder->type < 0 || encoder->type > LZ_IMAGE_TYPE_A8) {
+        encoder->usr->error(encoder->usr, "invalid lz type %d\n", encoder->type);
+    }
     encoder->width = decode_32(encoder);
     encoder->height = decode_32(encoder);
     encoder->stride = decode_32(encoder);
-- 
2.17.1

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