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authorAl Viro <viro@zeniv.linux.org.uk>2014-02-02 07:05:05 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2014-02-09 15:21:16 -0500
commitc9efe51165fa0aff57be54e3cb0201ac87f68980 (patch)
tree2c956f57a8c176d0df62a16adc33a2d31b78a929 /net/tipc/ref.h
parentd311d79de305f1ada47cadd672e6ed1b28a949eb (diff)
fix a kmap leak in virtio_console
While we are at it, don't do kmap() under kmap_atomic(), *especially* for a page we'd allocated with GFP_KERNEL. It's spelled "page_address", and had that been more than that, we'd have a real trouble - kmap_high() can block, and doing that while holding kmap_atomic() is a Bad Idea(tm). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/tipc/ref.h')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-07 03:41:01 -0400
title='author Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> 2007-07-08 01:23:21 -0400 committer David S. Miller <davem@sunset.davemloft.net> 2007-07-11 01:17:17 -0400 [NETFILTER]: nf_conntrack: introduce extension infrastructure' href='/cgit/cgit.cgi/litmus-rt-ext-res.git/commit/include/net/netfilter/nf_conntrack_extend.h?id=ecfab2c9fe5597221c2b30dec48634a2361a0d08'>ecfab2c9fe55 
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#ifndef _NF_CONNTRACK_EXTEND_H
#define _NF_CONNTRACK_EXTEND_H

#include <linux/slab.h>

#include <net/netfilter/nf_conntrack.h>

enum nf_ct_ext_id {
	NF_CT_EXT_HELPER,
	NF_CT_EXT_NAT,
	NF_CT_EXT_ACCT,
	NF_CT_EXT_ECACHE,
	NF_CT_EXT_ZONE,
	NF_CT_EXT_NUM,
};

#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
#define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter
#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone

/* Extensions: optional stuff which isn't permanently in struct. */
struct nf_ct_ext {
	struct rcu_head rcu;
	u8 offset[NF_CT_EXT_NUM];
	u8 len;
	char data[0];
};

static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
{
	return !!ext->offset[id];
}

static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
{
	return (ct->ext && __nf_ct_ext_exist(ct->ext, id));
}

static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id)
{
	if (!nf_ct_ext_exist(ct, id))
		return NULL;

	return (void *)ct->ext + ct->ext->offset[id];
}
#define nf_ct_ext_find(ext, id)	\
	((id##_TYPE *)__nf_ct_ext_find((ext), (id)))

/* Destroy all relationships */
extern void __nf_ct_ext_destroy(struct nf_conn *ct);
static inline void nf_ct_ext_destroy(struct nf_conn *ct)
{
	if (ct->ext)
		__nf_ct_ext_destroy(ct);
}

/* Free operation. If you want to free a object referred from private area,
 * please implement __nf_ct_ext_free() and call it.
 */
static inline void nf_ct_ext_free(struct nf_conn *ct)
{
	if (ct->ext)
		kfree(ct->ext);
}

/* Add this type, returns pointer to data or NULL. */
void *
__nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
#define nf_ct_ext_add(ct, id, gfp) \
	((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp)))

#define NF_CT_EXT_F_PREALLOC	0x0001

struct nf_ct_ext_type {
	/* Destroys relationships (can be NULL). */
	void (*destroy)(struct nf_conn *ct);
	/* Called when realloacted (can be NULL).
	   Contents has already been moved. */
	void (*move)(void *new, void *old);

	enum nf_ct_ext_id id;

	unsigned int flags;

	/* Length and min alignment. */
	u8 len;
	u8 align;
	/* initial size of nf_ct_ext. */
	u8 alloc_size;
};

int nf_ct_extend_register(struct nf_ct_ext_type *type);
void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
#endif /* _NF_CONNTRACK_EXTEND_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-07 03:41:01 -0400