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net: add networking namespace refcount tracker
We have 100+ syzbot reports about netns being dismantled too soon, still unresolved as of today. We think a missing get_net() or an extra put_net() is the root cause. In order to find the bug(s), and be able to spot future ones, this patch adds CONFIG_NET_NS_REFCNT_TRACKER and new helpers to precisely pair all put_net() with corresponding get_net(). To use these helpers, each data structure owning a refcount should also use a "netns_tracker" to pair the get and put. Signed-off-by: Eric Dumazet <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]>
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Original file line number | Diff line number | Diff line change |
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/* SPDX-License-Identifier: GPL-2.0 */ | ||
#ifndef __NET_NET_TRACKERS_H | ||
#define __NET_NET_TRACKERS_H | ||
#include <linux/ref_tracker.h> | ||
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#ifdef CONFIG_NET_DEV_REFCNT_TRACKER | ||
typedef struct ref_tracker *netdevice_tracker; | ||
#else | ||
typedef struct {} netdevice_tracker; | ||
#endif | ||
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#ifdef CONFIG_NET_NS_REFCNT_TRACKER | ||
typedef struct ref_tracker *netns_tracker; | ||
#else | ||
typedef struct {} netns_tracker; | ||
#endif | ||
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#endif /* __NET_NET_TRACKERS_H */ |
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