[PATCH] [perf] Fix null pointer deference in nest_epollfd

[Gaurav Singh]

Add a NULL check for worker before dereferencing.

Signed-off-by: Gaurav Singh <gaurav1...@gmail.com>
---
 tools/perf/bench/epoll-wait.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/bench/epoll-wait.c b/tools/perf/bench/epoll-wait.c
index 75dca9773186..42983eb7f82e 100644
--- a/tools/perf/bench/epoll-wait.c
+++ b/tools/perf/bench/epoll-wait.c
@@ -239,6 +239,9 @@ static void *workerfn(void *arg)
 
 static void nest_epollfd(struct worker *w)
 {
+       if (!w)
+               return;
+
        unsigned int i;
        struct epoll_event ev;
        int efd = multiq ? w->epollfd : epollfd;
-- 
2.17.1