Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 19/24] perf probe: Fix to die_entrypc() returns error correctly | Date | Tue, 1 Dec 2020 09:53:25 +0100 |
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From: Masami Hiramatsu <mhiramat@kernel.org>
[ Upstream commit ab4200c17ba6fe71d2da64317aae8a8aa684624c ]
Fix die_entrypc() to return error correctly if the DIE has no DW_AT_ranges attribute. Since dwarf_ranges() will treat the case as an empty ranges and return 0, we have to check it by ourselves.
Fixes: 91e2f539eeda ("perf probe: Fix to show function entry line as probe-able") Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Sumanth Korikkar <sumanthk@linux.ibm.com> Cc: Thomas Richter <tmricht@linux.ibm.com> Link: http://lore.kernel.org/lkml/160645612634.2824037.5284932731175079426.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- tools/perf/util/dwarf-aux.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index fd460aca36e55..40e4c933b3728 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -305,6 +305,7 @@ bool die_is_func_def(Dwarf_Die *dw_die) int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr) { Dwarf_Addr base, end; + Dwarf_Attribute attr; if (!addr) return -EINVAL; @@ -312,6 +313,13 @@ int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr) if (dwarf_entrypc(dw_die, addr) == 0) return 0; + /* + * Since the dwarf_ranges() will return 0 if there is no + * DW_AT_ranges attribute, we should check it first. + */ + if (!dwarf_attr(dw_die, DW_AT_ranges, &attr)) + return -ENOENT; + return dwarf_ranges(dw_die, 0, &base, addr, &end) < 0 ? -ENOENT : 0; } -- 2.27.0
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