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Message-Id: <20201201084730.140799760@linuxfoundation.org>
Date: Tue, 1 Dec 2020 09:54:15 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
Sumanth Korikkar <sumanthk@...ux.ibm.com>,
Thomas Richter <tmricht@...ux.ibm.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 140/152] perf probe: Fix to die_entrypc() returns error correctly
From: Masami Hiramatsu <mhiramat@...nel.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@...nel.org>
Cc: Sumanth Korikkar <sumanthk@...ux.ibm.com>
Cc: Thomas Richter <tmricht@...ux.ibm.com>
Link: http://lore.kernel.org/lkml/160645612634.2824037.5284932731175079426.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 aa898014ad12f..03c1a39c312a8 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -373,6 +373,7 @@ 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;
@@ -380,6 +381,13 @@ 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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