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| author | Ralf Baechle <ralf@linux-mips.org> | 2005-08-23 10:11:45 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-08-23 10:11:45 -0700 |
| commit | 01d7dd0e9f8c5f1888619d2649c7da389232b408 (patch) | |
| tree | ee4f22a33557bae4883eb2f4fb1359e97ac74186 /include | |
| parent | 53b924b31fa53ac3007df3fef6870d5074a9adf8 (diff) | |
| download | linux-01d7dd0e9f8c5f1888619d2649c7da389232b408.tar.gz linux-01d7dd0e9f8c5f1888619d2649c7da389232b408.tar.bz2 linux-01d7dd0e9f8c5f1888619d2649c7da389232b408.zip | |
[AX25]: UID fixes
o Brown paperbag bug - ax25_findbyuid() was always returning a NULL pointer
as the result. Breaks ROSE completly and AX.25 if UID policy set to deny.
o While the list structure of AX.25's UID to callsign mapping table was
properly protected by a spinlock, it's elements were not refcounted
resulting in a race between removal and usage of an element.
Signed-off-by: Ralf Baechle DL5RB <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/ax25.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/include/net/ax25.h b/include/net/ax25.h index 828a3a93dda1..3696f988a9f1 100644 --- a/include/net/ax25.h +++ b/include/net/ax25.h @@ -139,11 +139,25 @@ enum { #define AX25_DEF_DS_TIMEOUT (3 * 60 * HZ) /* DAMA timeout 3 minutes */ typedef struct ax25_uid_assoc { - struct ax25_uid_assoc *next; + struct hlist_node uid_node; + atomic_t refcount; uid_t uid; ax25_address call; } ax25_uid_assoc; +#define ax25_uid_for_each(__ax25, node, list) \ + hlist_for_each_entry(__ax25, node, list, uid_node) + +#define ax25_uid_hold(ax25) \ + atomic_inc(&((ax25)->refcount)) + +static inline void ax25_uid_put(ax25_uid_assoc *assoc) +{ + if (atomic_dec_and_test(&assoc->refcount)) { + kfree(assoc); + } +} + typedef struct { ax25_address calls[AX25_MAX_DIGIS]; unsigned char repeated[AX25_MAX_DIGIS]; @@ -376,7 +390,7 @@ extern unsigned long ax25_display_timer(struct timer_list *); /* ax25_uid.c */ extern int ax25_uid_policy; -extern ax25_address *ax25_findbyuid(uid_t); +extern ax25_uid_assoc *ax25_findbyuid(uid_t); extern int ax25_uid_ioctl(int, struct sockaddr_ax25 *); extern struct file_operations ax25_uid_fops; extern void ax25_uid_free(void); |