xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mac80211: atomically check whether STA exists already

Browse Source 
When a STA structure is added, it is often checked whether it
already exists before adding it. This, however, isn't done
atomically so there is a race condition that could lead to two
STA structures being added with the same MAC address. This
patch changes sta_info_add() to return an ERR_PTR in case
of failure and adds the failure mode -EEXIST when the STA
already exists.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Luis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2008-02-21 14:09:30 +01:00
committed by John W. Linville
parent d46e144b65
commit 43ba7e958f
5 changed files with 39 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
net/mac80211/sta_info.h
View File

@@ -239,8 +239,8 @@ static inline void __sta_info_get(struct sta_info *sta)
struct sta_info * sta_info_get(struct ieee80211_local *local, u8 *addr);
void sta_info_put(struct sta_info *sta);
struct sta_info * sta_info_add(struct ieee80211_local *local,
struct net_device *dev, u8 *addr, gfp_t gfp);
struct sta_info *sta_info_add(struct ieee80211_local *local,
struct net_device *dev, u8 *addr, gfp_t gfp);
void sta_info_remove(struct sta_info *sta);
void sta_info_free(struct sta_info *sta);
void sta_info_init(struct ieee80211_local *local);