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nova: handle cap count error if IPC dst invalid

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Fixes #1995
This commit is contained in:
Alexander Boettcher 2016-06-03 14:38:59 +02:00 committed by Christian Helmuth
parent 1e5c08bb1a
commit 56890733af
1 changed files with 6 additions and 3 deletions
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9
repos/base-nova/src/lib/base/ipc.cc
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@ -58,14 +58,17 @@ Rpc_exception_code Genode::ipc_call(Native_capability dst,
/* establish the mapping via a portal traversal */
uint8_t res = Nova::call(dst.local_name());
if (res != Nova::NOVA_OK) {
if (res != Nova::NOVA_OK)
/* If an error occurred, reset word&item count (not done by kernel). */
utcb.set_msg_word(0);
return Rpc_exception_code(Rpc_exception_code::INVALID_OBJECT);
}
/* track potentially received caps and invalidate unused caps slots */
rcv_window.post_ipc(utcb, dst.rcv_window());
if (res != Nova::NOVA_OK)
return Rpc_exception_code(Rpc_exception_code::INVALID_OBJECT);
/* handle malformed reply from a server */
if (utcb.msg_words() < 1)
return Rpc_exception_code(Rpc_exception_code::INVALID_OBJECT);