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perf test: Fix variable length array undefined behavior in bp_account 

Fix:

  tests/bp_account.c:154:9: runtime error: variable length array bound evaluates to non-positive value 0

by switching from a variable length to an allocated array.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20220610180247.444798-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2022-06-10 11:02:47 -07:00 committed by Arnaldo Carvalho de Melo
parent 94725994cf
commit cc2145526c
1 changed files with 14 additions and 2 deletions
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16
tools/perf/tests/bp_account.c
View File

@ -151,11 +151,21 @@ static int detect_ioctl(void)
static int detect_share(int wp_cnt, int bp_cnt)
{
struct perf_event_attr attr;
int i, fd[wp_cnt + bp_cnt], ret;
int i, *fd = NULL, ret = -1;
if (wp_cnt + bp_cnt == 0)
return 0;
fd = malloc(sizeof(int) * (wp_cnt + bp_cnt));
if (!fd)
return -1;
for (i = 0; i < wp_cnt; i++) {
fd[i] = wp_event((void *)&the_var, &attr);
TEST_ASSERT_VAL("failed to create wp\n", fd[i] != -1);
if (fd[i] == -1) {
pr_err("failed to create wp\n");
goto out;
}
}
for (; i < (bp_cnt + wp_cnt); i++) {
@ -166,9 +176,11 @@ static int detect_share(int wp_cnt, int bp_cnt)
ret = i != (bp_cnt + wp_cnt);
out:
while (i--)
close(fd[i]);
free(fd);
return ret;
}