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From: Borislav Petkov <bp@alien8.de>
To: Andy Lutomirski <luto@amacapital.net>,
	Masami Hiramatsu <mhiramat@kernel.org>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH v1 06/19] perf/x86/intel/ds: Check insn_get_length() retval
Date: Wed, 23 Dec 2020 18:42:20 +0100	[thread overview]
Message-ID: <20201223174233.28638-7-bp@alien8.de> (raw)
In-Reply-To: <20201223174233.28638-1-bp@alien8.de>

From: Borislav Petkov <bp@suse.de>

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 <bp@suse.de>
---
 arch/x86/events/intel/ds.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index 67dbc91bccfe..3786b4e07078 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1265,14 +1265,14 @@ 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.
 		 */
-		if (!insn.length)
+		if (insn_get_length(&insn) || !insn.length)
 			break;
 
 		to += insn.length;
-- 
2.29.2


  parent reply	other threads:[~2020-12-23 17:44 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-23 17:42 [PATCH v1 00/19] x86/insn: Add an insn_decode() API Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 01/19] x86/insn: Rename insn_decode() to insn_decode_regs() Borislav Petkov
2020-12-28 17:16   ` Sean Christopherson
2020-12-29 19:36     ` Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 02/19] x86/insn: Add @buf_len param to insn_init() kernel-doc comment Borislav Petkov
2020-12-28  1:44   ` Masami Hiramatsu
2020-12-23 17:42 ` [PATCH v1 03/19] x86/insn: Add an insn_decode() API Borislav Petkov
2020-12-28  1:15   ` Masami Hiramatsu
2020-12-29 20:06     ` Borislav Petkov
2020-12-30  9:00       ` Masami Hiramatsu
2020-12-30  9:28         ` Borislav Petkov
2021-01-06  5:21           ` Masami Hiramatsu
2021-01-08 18:59             ` Borislav Petkov
2021-01-12 11:34               ` Masami Hiramatsu
2021-01-13 18:06                 ` Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 04/19] x86/insn-eval: Handle return values from the decoder Borislav Petkov
2020-12-28 18:51   ` Sean Christopherson
2020-12-28 19:06     ` Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 05/19] x86/boot/compressed/sev-es: Convert to insn_decode() Borislav Petkov
2020-12-23 17:42 ` Borislav Petkov [this message]
2021-01-04 13:19   ` [PATCH v1 06/19] perf/x86/intel/ds: Check insn_get_length() retval Peter Zijlstra
2021-01-19 10:40     ` Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 07/19] perf/x86/intel/ds: Check return values of insn decoder functions Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 08/19] x86/alternative: Use insn_decode() Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 09/19] x86/mce: Convert to insn_decode() Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 10/19] x86/kprobes: " Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 11/19] x86/sev-es: " Borislav Petkov
2020-12-25 10:50   ` kernel test robot
2020-12-25 12:33     ` Borislav Petkov
2020-12-28 19:15       ` Sean Christopherson
2021-01-21 16:58         ` Borislav Petkov
2021-01-21 22:35           ` Sean Christopherson
2020-12-23 17:42 ` [PATCH v1 12/19] x86/traps: " Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 13/19] x86/uprobes: " Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 14/19] x86/tools/insn_decoder_test: " Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 15/19] tools/objtool: " Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 16/19] x86/tools/insn_sanity: " Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 17/19] tools/perf: " Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 18/19] x86/insn: Remove kernel_insn_init() Borislav Petkov
2020-12-23 17:42 ` [PATCH v1 19/19] x86/insn: Make insn_complete() static Borislav Petkov
2020-12-27 15:26 ` [PATCH v1 00/19] x86/insn: Add an insn_decode() API Tom Lendacky
2021-02-03 12:00   ` Borislav Petkov

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