linux-kernel - [PATCH] fs/coda: add error handling for fget

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Message-Id: <1528778052-41025-1-git-send-email-jiazhouyang09@gmail.com>
Date:   Tue, 12 Jun 2018 12:34:12 +0800
From:   Zhouyang Jia <jiazhouyang09@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Zhouyang Jia <jiazhouyang09@...il.com>,
        Jan Harkes <jaharkes@...cmu.edu>, coda@...cmu.edu,
        codalist@...a.cs.cmu.edu, linux-kernel@...r.kernel.org
Subject: [PATCH] fs/coda: add error handling for fget

When fget fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling fget.

Signed-off-by: Zhouyang Jia <jiazhouyang09@...il.com>
---
 fs/coda/psdev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c
index c5234c2..55824cb 100644
--- a/fs/coda/psdev.c
+++ b/fs/coda/psdev.c
@@ -187,8 +187,11 @@ static ssize_t coda_psdev_write(struct file *file, const char __user *buf,
 	if (req->uc_opcode == CODA_OPEN_BY_FD) {
 		struct coda_open_by_fd_out *outp =
 			(struct coda_open_by_fd_out *)req->uc_data;
-		if (!outp->oh.result)
+		if (!outp->oh.result) {
 			outp->fh = fget(outp->fd);
+			if (!outp->fh)
+				return -EBADF;
+		}
 	}
 
         wake_up(&req->uc_sleep);
-- 
2.7.4