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x86/alternative: Use insn_decode()

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commit 63c66cde7bbcc79aac14b25861c5b2495eede57b upstream.

No functional changes, just simplification.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210304174237.31945-10-bp@alien8.de
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov 2020-11-06 19:37:25 +01:00 committed by Greg Kroah-Hartman
parent e6f8dc86a1
commit d9cd219114
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kernel/alternative.c
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@ -1284,15 +1284,15 @@ static void text_poke_loc_init(struct text_poke_loc *tp, void *addr,
const void *opcode, size_t len, const void *emulate)
{
struct insn insn;
int ret;
memcpy((void *)tp->text, opcode, len);
if (!emulate)
emulate = opcode;
kernel_insn_init(&insn, emulate, MAX_INSN_SIZE);
insn_get_length(&insn);
ret = insn_decode(&insn, emulate, MAX_INSN_SIZE, INSN_MODE_KERN);
BUG_ON(!insn_complete(&insn));
BUG_ON(ret < 0);
BUG_ON(len != insn.length);
tp->rel_addr = addr - (void *)_stext;