linux-kernel - [PATCH] perf jevents: fix getting maximum number of fds

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Date:   Tue, 25 May 2021 18:07:58 +0200
From:   Felix Fietkau <nbd@....name>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] perf jevents: fix getting maximum number of fds

On some hosts, rlim.rlim_max can be returned as RLIM_INFINITY.
By casting it to int, it is interpreted as -1, which will cause get_maxfds
to return 0, causing "Invalid argument" errors in nftw() calls.
Fix this by casting the second argument of min() to rlim_t instead.

Fixes: 80eeb67fe577 ("perf jevents: Program to convert JSON file")
Signed-off-by: Felix Fietkau <nbd@....name>
---
 tools/perf/pmu-events/jevents.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index ed4f0bd72e5a..412565027fbb 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -960,7 +960,7 @@ static int get_maxfds(void)
 	struct rlimit rlim;
 
 	if (getrlimit(RLIMIT_NOFILE, &rlim) == 0)
-		return min((int)rlim.rlim_max / 2, 512);
+		return min(rlim.rlim_max / 2, (rlim_t)512);
 
 	return 512;
 }
-- 
2.30.1