From 2ff49881d606d5e0d5b27cb6066c8a18689bd341 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Fri, 6 Nov 2020 16:33:34 +0100 Subject: perf/x86/intel/ds: Check insn_get_length() retval intel_pmu_pebs_fixup_ip() needs only the insn length so use the appropriate helper instead of a full decode. A full decode differs only in running insn_complete() on the decoded insn but that is not needed here. Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20210304174237.31945-8-bp@alien8.de --- arch/x86/events/intel/ds.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) (limited to 'arch/x86/events/intel') diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c index 7ebae1826403..cdd195a3804e 100644 --- a/arch/x86/events/intel/ds.c +++ b/arch/x86/events/intel/ds.c @@ -1353,14 +1353,13 @@ static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs) is_64bit = kernel_ip(to) || any_64bit_mode(regs); #endif insn_init(&insn, kaddr, size, is_64bit); - insn_get_length(&insn); + /* - * Make sure there was not a problem decoding the - * instruction and getting the length. This is - * doubly important because we have an infinite - * loop if insn.length=0. + * Make sure there was not a problem decoding the instruction. + * This is doubly important because we have an infinite loop if + * insn.length=0. */ - if (!insn.length) + if (insn_get_length(&insn)) break; to += insn.length; -- cgit