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| author | Johannes Berg <johannes.berg@intel.com> | 2011-07-06 21:59:39 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-07-08 11:11:19 -0400 |
| commit | aba83a0b301c32dbb91c017f33307611e1a1d384 (patch) | |
| tree | 9f8478ddf2160c9b4c50666e037e6239ea52e274 /net/mac80211/debugfs_key.c | |
| parent | 523b02ea23b175dd3e46e3daf1bc9354376640a3 (diff) | |
| download | linux-aba83a0b301c32dbb91c017f33307611e1a1d384.tar.gz | |
mac80211: fix CCMP races
Since we can process multiple packets at the same time for different ACs, but the PN is allocated from a single counter, we need to use an atomic value there. Use atomic64_t to make this cheaper on 64-bit platforms, other platforms will support this through software emulation, see lib/atomic64.c. We also need to use an on-stack scratch buf so that multiple packets won't corrupt each others scratch buffers. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/debugfs_key.c')
| -rw-r--r-- | net/mac80211/debugfs_key.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c index 33c58b85c911..4433760db4c7 100644 --- a/net/mac80211/debugfs_key.c +++ b/net/mac80211/debugfs_key.c @@ -79,6 +79,7 @@ static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { const u8 *tpn; + u64 pn; char buf[20]; int len; struct ieee80211_key *key = file->private_data; @@ -94,9 +95,10 @@ static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf, key->u.tkip.tx.iv16); break; case WLAN_CIPHER_SUITE_CCMP: - tpn = key->u.ccmp.tx_pn; + pn = atomic64_read(&key->u.ccmp.tx_pn); len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n", - tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]); + (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24), + (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn); break; case WLAN_CIPHER_SUITE_AES_CMAC: tpn = key->u.aes_cmac.tx_pn; |