linux-kernel - [PATCH -next] fs: Fix memory leaks in do

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Date:   Fri, 30 Oct 2020 11:24:07 -0400
From:   Qian Cai <cai@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@...hat.com>
Subject: [PATCH -next] fs: Fix memory leaks in do_renameat2() error paths

We will need to call putname() before do_renameat2() returning -EINVAL
to avoid memory leaks.

Fixes: 3c5499fa56f5 ("fs: make do_renameat2() take struct filename")
Signed-off-by: Qian Cai <cai@...hat.com>
---
 fs/namei.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 27f5a4e025fd..9dc5e1b139c9 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4362,11 +4362,11 @@ int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
 	int error;
 
 	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
-		return -EINVAL;
+		goto out;
 
 	if ((flags & (RENAME_NOREPLACE | RENAME_WHITEOUT)) &&
 	    (flags & RENAME_EXCHANGE))
-		return -EINVAL;
+		goto out;
 
 	if (flags & RENAME_EXCHANGE)
 		target_flags = 0;
@@ -4486,6 +4486,14 @@ int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
 	}
 exit:
 	return error;
+out:
+	if (!IS_ERR(oldname))
+		putname(oldname);
+
+	if (!IS_ERR(newname))
+		putname(newname);
+
+	return -EINVAL;
 }
 
 SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
-- 
2.28.0