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Thu, 23 Apr 2026 02:13:24 -0700 (PDT) Message-ID: <204607f3-16fc-4be8-91ac-bf38c6dc31f9@linaro.org> Date: Thu, 23 Apr 2026 10:13:22 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] perf dwarf-regs: Fix off by one in __get_dwarf_regnum_for_perf_regnum_csky() To: Dan Carpenter , Ian Rogers Cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Adrian Hunter , Guo Ren , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, kernel-janitors@vger.kernel.org References: Content-Language: en-US From: James Clark In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 23/04/2026 08:00, Dan Carpenter wrote: > Change the > comparison >= to prevent an out of bounds access of > the dwarf_csky_regnumsp[] array. > > Fixes: 8cac4013b0c2 ("perf dwarf-regs: Add csky perf to dwarf register number mapping functions") > Signed-off-by: Dan Carpenter > --- > --- > tools/perf/util/dwarf-regs-arch/dwarf-regs-csky.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/perf/util/dwarf-regs-arch/dwarf-regs-csky.c b/tools/perf/util/dwarf-regs-arch/dwarf-regs-csky.c > index cb44b774f8d9..4c586a5cb763 100644 > --- a/tools/perf/util/dwarf-regs-arch/dwarf-regs-csky.c > +++ b/tools/perf/util/dwarf-regs-arch/dwarf-regs-csky.c > @@ -118,7 +118,7 @@ int __get_dwarf_regnum_for_perf_regnum_csky(int perf_regnum, unsigned int flags) > if (flags & EF_CSKY_ABIV2) > idx++; > > - if (perf_regnum < 0 || perf_regnum > (int)ARRAY_SIZE(dwarf_csky_regnums) || > + if (perf_regnum < 0 || perf_regnum >= (int)ARRAY_SIZE(dwarf_csky_regnums) || > dwarf_csky_regnums[perf_regnum][idx] == 0) > return -ENOENT; > Reviewed-by: James Clark