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perf jevents: Fix getting maximum number of fds

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commit 75ea44e356b5de8c817f821c9dd68ae329e82add upstream.

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: 80eeb67fe5 ("perf jevents: Program to convert JSON file")
Signed-off-by: Felix Fietkau <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sukadev Bhattiprolu <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Felix Fietkau 2021-05-25 18:07:58 +02:00 • committed by Greg Kroah-Hartman
commit bd7a3b3ed9
1 changed files with 1 additions and 1 deletions
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2
tools/perf/pmu-events/jevents.c
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@ -862,7 +862,7 @@ 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;
}