From: Colin Ian King <[email protected]> Currently when cnt is 100 an array bounds overflow occurs on the assignment of fd[cnt]. Fix this by performing the bounds check on cnt before writing to fd.
Detected by cppcheck: tools/perf/tests/bp_account.c:115: (warning) Either the condition 'cnt==100' is redundant or the array 'fd[100]' is accessed at index 100, which is out of bounds. Signed-off-by: Colin King <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: [email protected] Fixes: 032db28e5fa3 ("perf tests: Add breakpoint accounting/modify test") Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/tests/bp_account.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/tools/perf/tests/bp_account.c b/tools/perf/tests/bp_account.c index 2f75fa0c4fef..9e88d7608951 100644 --- a/tools/perf/tests/bp_account.c +++ b/tools/perf/tests/bp_account.c @@ -107,16 +107,14 @@ static int detect_cnt(bool is_x) int fd[100], cnt = 0, i; while (1) { - fd[cnt] = __event(is_x, addr, &attr); - - if (fd[cnt] < 0) - break; - if (cnt == 100) { pr_debug("way too many debug registers, fix the test\n"); return 0; } + fd[cnt] = __event(is_x, addr, &attr); + if (fd[cnt] < 0) + break; cnt++; } -- 2.14.3
