* [PATCH] perf dwarf-regs: s390: Fix an off by one bug
@ 2026-04-23 7:07 Dan Carpenter
2026-04-23 10:03 ` Thomas Richter
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2026-04-23 7:07 UTC (permalink / raw)
To: Ian Rogers
Cc: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Namhyung Kim, Alexander Shishkin, Jiri Olsa, Guo Ren,
linux-perf-users, linux-kernel, kernel-janitors
Change the > comparison to >= to prevent an out of bounds access of
the dwarf_s390_regnums[] array.
Fixes: 1e452dd850f3 ("perf dwarf-regs: Add S390 perf to DWARF register number mapping functions")
Signed-off-by: Dan Carpenter <error27@gmail.com>
---
tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c | 1 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c b/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
index 310a37451bdc..f79216a7665a 100644
--- a/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
+++ b/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
@@ -45,7 +45,7 @@ int __get_dwarf_regnum_for_perf_regnum_s390(int perf_regnum)
if (perf_regnum == 0)
return 0;
- if (perf_regnum < 0 || perf_regnum > (int)ARRAY_SIZE(dwarf_s390_regnums) ||
+ if (perf_regnum < 0 || perf_regnum >= (int)ARRAY_SIZE(dwarf_s390_regnums) ||
dwarf_s390_regnums[perf_regnum] == 0)
return -ENOENT;
--
2.53.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] perf dwarf-regs: s390: Fix an off by one bug
2026-04-23 7:07 [PATCH] perf dwarf-regs: s390: Fix an off by one bug Dan Carpenter
@ 2026-04-23 10:03 ` Thomas Richter
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Richter @ 2026-04-23 10:03 UTC (permalink / raw)
To: Dan Carpenter, Ian Rogers
Cc: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Namhyung Kim, Alexander Shishkin, Jiri Olsa, Guo Ren,
linux-perf-users, linux-kernel, kernel-janitors
On 4/23/26 09:07, Dan Carpenter wrote:
> Change the > comparison to >= to prevent an out of bounds access of
> the dwarf_s390_regnums[] array.
>
> Fixes: 1e452dd850f3 ("perf dwarf-regs: Add S390 perf to DWARF register number mapping functions")
> Signed-off-by: Dan Carpenter <error27@gmail.com>
> ---
> tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c | 1 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c b/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
> index 310a37451bdc..f79216a7665a 100644
> --- a/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
> +++ b/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
> @@ -45,7 +45,7 @@ int __get_dwarf_regnum_for_perf_regnum_s390(int perf_regnum)
> if (perf_regnum == 0)
> return 0;
>
> - if (perf_regnum < 0 || perf_regnum > (int)ARRAY_SIZE(dwarf_s390_regnums) ||
> + if (perf_regnum < 0 || perf_regnum >= (int)ARRAY_SIZE(dwarf_s390_regnums) ||
> dwarf_s390_regnums[perf_regnum] == 0)
> return -ENOENT;
>
Acked-by: Thomas Richter <tmricht@linux.ibm.com>
--
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Wolfgang Wendt
Geschäftsführung: David Faller
Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294
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2026-04-23 10:03 ` Thomas Richter
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