linux-kernel - [PATCH 5.10 8/9] perf unwind: Set userdata for all __report

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Date:   Thu, 27 May 2021 17:13:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Rigby <d.rigby@...com>,
        Jan Kratochvil <jan.kratochvil@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        "Tommi Rantala" <tommi.t.rantala@...ia.com>
Subject: [PATCH 5.10 8/9] perf unwind: Set userdata for all __report_module() paths

From: Dave Rigby <d.rigby@...com>

commit 4e1481445407b86a483616c4542ffdc810efb680 upstream.

When locating the DWARF module for a given address, __find_debuginfo()
requires a 'struct dso' passed via the userdata argument.

However, this field is only set in __report_module() if the module is
found in via dwfl_addrmodule(), not if it is found later via
dwfl_report_elf().

Set userdata irrespective of how the DWARF module was found, as long as
we found a module.

Fixes: bf53fc6b5f41 ("perf unwind: Fix separate debug info files when using elfutils' libdw's unwinder")
Signed-off-by: Dave Rigby <d.rigby@...com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=211801
Acked-by: Jan Kratochvil <jan.kratochvil@...hat.com>
Acked-by: Jiri Olsa <jolsa@...hat.com>
Link: https://lore.kernel.org/linux-perf-users/20210218165654.36604-1-d.rigby@me.com/
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: "Tommi Rantala" <tommi.t.rantala@...ia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/perf/util/unwind-libdw.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -60,10 +60,8 @@ static int __report_module(struct addr_l
 	mod = dwfl_addrmodule(ui->dwfl, ip);
 	if (mod) {
 		Dwarf_Addr s;
-		void **userdatap;
 
-		dwfl_module_info(mod, &userdatap, &s, NULL, NULL, NULL, NULL, NULL);
-		*userdatap = dso;
+		dwfl_module_info(mod, NULL, &s, NULL, NULL, NULL, NULL, NULL);
 		if (s != al->map->start - al->map->pgoff)
 			mod = 0;
 	}
@@ -79,6 +77,13 @@ static int __report_module(struct addr_l
 					      al->map->start - al->map->pgoff, false);
 	}
 
+	if (mod) {
+		void **userdatap;
+
+		dwfl_module_info(mod, &userdatap, NULL, NULL, NULL, NULL, NULL, NULL);
+		*userdatap = dso;
+	}
+
 	return mod && dwfl_addrmodule(ui->dwfl, ip) == mod ? 0 : -1;
 }