From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     David Sterba <dsterba@suse.com>,
        syzbot+4376a9a073770c173269@syzkaller.appspotmail.com,
        Sasha Levin <sashal@kernel.org>, clm@fb.com,
        josef@toxicpanda.com, linux-btrfs@vger.kernel.org
Subject: [PATCH AUTOSEL 6.1 11/24] btrfs: send: limit number of clones and allocated memory size
Date:   Wed, 15 Feb 2023 15:45:34 -0500
Message-Id: <20230215204547.2760761-11-sashal@kernel.org>
In-Reply-To: <20230215204547.2760761-1-sashal@kernel.org>
References: <20230215204547.2760761-1-sashal@kernel.org>
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From: David Sterba <dsterba@suse.com>

[ Upstream commit 33e17b3f5ab74af12aca58c515bc8424ff69a343 ]

The arg->clone_sources_count is u64 and can trigger a warning when a
huge value is passed from user space and a huge array is allocated.
Limit the allocated memory to 8MiB (can be increased if needed), which
in turn limits the number of clone sources to 8M / sizeof(struct
clone_root) = 8M / 40 = 209715.  Real world number of clones is from
tens to hundreds, so this is future proof.

Reported-by: syzbot+4376a9a073770c173269@syzkaller.appspotmail.com
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/btrfs/send.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 1c4b693ee4a3a..937b60ae576e0 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -7839,10 +7839,10 @@ long btrfs_ioctl_send(struct inode *inode, struct btrfs_ioctl_send_args *arg)
 	/*
 	 * Check that we don't overflow at later allocations, we request
 	 * clone_sources_count + 1 items, and compare to unsigned long inside
-	 * access_ok.
+	 * access_ok. Also set an upper limit for allocation size so this can't
+	 * easily exhaust memory. Max number of clone sources is about 200K.
 	 */
-	if (arg->clone_sources_count >
-	    ULONG_MAX / sizeof(struct clone_root) - 1) {
+	if (arg->clone_sources_count > SZ_8M / sizeof(struct clone_root)) {
 		ret = -EINVAL;
 		goto out;
 	}
-- 
2.39.0