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Date:   Thu, 16 Jan 2020 12:02:12 -0500
From:   Sasha Levin <>
Cc:     Quentin Monnet <>,
        Jakub Kicinski <>,
        Alexei Starovoitov <>,
        Sasha Levin <>,,
Subject: [PATCH AUTOSEL 4.19 494/671] tools: bpftool: fix arguments for p_err() in do_event_pipe()

From: Quentin Monnet <>

[ Upstream commit 9def249dc8409ffc1f5a1d7195f1c462f2b49c07 ]

The last argument passed to some calls to the p_err() functions is not
correct, it should be "*argv" instead of "**argv". This may lead to a
segmentation fault error if CPU IDs or indices from the command line
cannot be parsed correctly. Let's fix this.

Fixes: f412eed9dfde ("tools: bpftool: add simple perf event output reader")
Signed-off-by: Quentin Monnet <>
Reviewed-by: Jakub Kicinski <>
Signed-off-by: Alexei Starovoitov <>
Signed-off-by: Sasha Levin <>
 tools/bpf/bpftool/map_perf_ring.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/bpf/bpftool/map_perf_ring.c b/tools/bpf/bpftool/map_perf_ring.c
index 6d41323be291..8ec0148d7426 100644
--- a/tools/bpf/bpftool/map_perf_ring.c
+++ b/tools/bpf/bpftool/map_perf_ring.c
@@ -205,7 +205,7 @@ int do_event_pipe(int argc, char **argv)
 			cpu = strtoul(*argv, &endptr, 0);
 			if (*endptr) {
-				p_err("can't parse %s as CPU ID", **argv);
+				p_err("can't parse %s as CPU ID", *argv);
 				goto err_close_map;
@@ -216,7 +216,7 @@ int do_event_pipe(int argc, char **argv)
 			index = strtoul(*argv, &endptr, 0);
 			if (*endptr) {
-				p_err("can't parse %s as index", **argv);
+				p_err("can't parse %s as index", *argv);
 				goto err_close_map;

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