From: Borislav Petkov <b...@suse.de>
vc_decode_insn() calls copy_from_kernel_nofault() by way of
vc_fetch_insn_kernel() to fetch 15 bytes max of opcodes to decode.
copy_from_kernel_nofault() returns negative on error and 0 on success.
The error case is handled by returning ES_EXCEPTION.
In the success case, the ret variable which contains the return value is
0 so there's no need to subtract it from MAX_INSN_SIZE when initializing
the insn buffer for further decoding. Remove it.
No functional changes.
Signed-off-by: Borislav Petkov <b...@suse.de>
---
arch/x86/kernel/sev-es.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 84c1821819af..1e78f4bd7bf2 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -267,7 +267,7 @@ static enum es_result vc_decode_insn(struct es_em_ctxt
*ctxt)
return ES_EXCEPTION;
}
- insn_init(&ctxt->insn, buffer, MAX_INSN_SIZE - res, 1);
+ insn_init(&ctxt->insn, buffer, MAX_INSN_SIZE, 1);
insn_get_length(&ctxt->insn);
}
--
2.29.2
