linux-kernel - [PATCH v1] fs/select: check return value of poll_select_set

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Date:   Mon, 22 Aug 2022 22:47:40 -0700
From:   lily <floridsleeves@...il.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     viro@...iv.linux.org.uk, lily <floridsleeves@...il.com>
Subject: [PATCH v1] fs/select: check return value of poll_select_set_timeout()

Check poll_select_set_timeout(), which could fail and return error.

Signed-off-by: Li Zhong <floridsleeves@...il.com>
---
 fs/select.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/select.c b/fs/select.c
index 0ee55af1a55c..d9febe1b846b 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -1073,8 +1073,8 @@ SYSCALL_DEFINE3(poll, struct pollfd __user *, ufds, unsigned int, nfds,
 
 	if (timeout_msecs >= 0) {
 		to = &end_time;
-		poll_select_set_timeout(to, timeout_msecs / MSEC_PER_SEC,
-			NSEC_PER_MSEC * (timeout_msecs % MSEC_PER_SEC));
+		if (poll_select_set_timeout(to, timeout_msecs / MSEC_PER_SEC, NSEC_PER_MSEC * (timeout_msecs % MSEC_PER_SEC)))
+			return -EINVAL;
 	}
 
 	ret = do_sys_poll(ufds, nfds, to);
-- 
2.25.1