linux-kernel - [PATCH 5.10 028/120] bpf, inode_storage: Put file handler if no storage was found

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Date:   Mon,  8 Feb 2021 16:00:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pan Bian <bianpan2016@....com>,
        Daniel Borkmann <daniel@...earbox.net>,
        KP Singh <kpsingh@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 028/120] bpf, inode_storage: Put file handler if no storage was found

From: Pan Bian <bianpan2016@....com>

[ Upstream commit b9557caaf872271671bdc1ef003d72f421eb72f6 ]

Put file f if inode_storage_ptr() returns NULL.

Fixes: 8ea636848aca ("bpf: Implement bpf_local_storage for inodes")
Signed-off-by: Pan Bian <bianpan2016@....com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: KP Singh <kpsingh@...nel.org>
Link: https://lore.kernel.org/bpf/20210121020856.25507-1-bianpan2016@163.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/bpf/bpf_inode_storage.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/bpf_inode_storage.c b/kernel/bpf/bpf_inode_storage.c
index dbc1dbdd2cbf0..c2a501cd90eba 100644
--- a/kernel/bpf/bpf_inode_storage.c
+++ b/kernel/bpf/bpf_inode_storage.c
@@ -125,8 +125,12 @@ static int bpf_fd_inode_storage_update_elem(struct bpf_map *map, void *key,
 
 	fd = *(int *)key;
 	f = fget_raw(fd);
-	if (!f || !inode_storage_ptr(f->f_inode))
+	if (!f)
+		return -EBADF;
+	if (!inode_storage_ptr(f->f_inode)) {
+		fput(f);
 		return -EBADF;
+	}
 
 	sdata = bpf_local_storage_update(f->f_inode,
 					 (struct bpf_local_storage_map *)map,
-- 
2.27.0