[PATCH spice-server] inputs-channel: Check message size handling migration data

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

Prevent possible buffer reading overflow.
Note that message pointer must be valid and data are checked
value by value so even on overflow you just get an error.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/inputs-channel.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/server/inputs-channel.c b/server/inputs-channel.c
index 2de1c7c80..3d43e90ff 100644
--- a/server/inputs-channel.c
+++ b/server/inputs-channel.c
@@ -507,6 +507,11 @@ static bool inputs_channel_handle_migrate_data(RedChannelClient *rcc,
     SpiceMigrateDataHeader *header;
     SpiceMigrateDataInputs *mig_data;
 
+    if (size < sizeof(SpiceMigrateDataHeader) + sizeof(SpiceMigrateDataInputs)) {
+        spice_warning("bad message size %u", size);
+        return FALSE;
+    }
+
     header = (SpiceMigrateDataHeader *)message;
     mig_data = (SpiceMigrateDataInputs *)(header + 1);
 
-- 
2.13.6

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