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wifi: mac80211: remove misleading j_0 construction parts

Message ID 20241021151414.798ceb7a5896.Ic57751edad228d56865ecf7433fef469e5e0a4aa@changeid
State New
Headers show
Series wifi: mac80211: remove misleading j_0 construction parts | expand

Commit Message

Johannes Berg Oct. 21, 2024, 1:14 p.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

The GCM algorithm implementation in the kernel assumes that
a 12-byte IV is passed, not the actual J_0 from the GCM spec.
Don't rename, that'd be messy, but also don't fill the bytes
beyond the IV that aren't used, since otherwise it looks as
though j_0[12] is used uninitialized.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 net/mac80211/wpa.c | 3 ---
 1 file changed, 3 deletions(-)
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Patch

diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 293afa3f57c5..40d5d9e48479 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -598,9 +598,6 @@  static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad,
 
 	memcpy(j_0, hdr->addr2, ETH_ALEN);
 	memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
-	j_0[13] = 0;
-	j_0[14] = 0;
-	j_0[AES_BLOCK_SIZE - 1] = 0x01;
 
 	ccmp_gcmp_aad(skb, aad, spp_amsdu);
 }