6.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Chien Wong m@xv97.com
[ Upstream commit 353cda30d30e5dc7cacf8de5d2546724708ae3bb ]
The called hash functions could fail thus we should check return values.
Fixes: 26717828b75d ("mac80211: aes-cmac: switch to shash CMAC driver") Signed-off-by: Chien Wong m@xv97.com Link: https://patch.msgid.link/20251113140511.48658-2-m@xv97.com Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/mac80211/aes_cmac.c | 63 +++++++++++++++++++++++++++++------------ net/mac80211/aes_cmac.h | 8 +++--- net/mac80211/wpa.c | 20 +++++++------ 3 files changed, 61 insertions(+), 30 deletions(-)
diff --git a/net/mac80211/aes_cmac.c b/net/mac80211/aes_cmac.c index 48c04f89de20a..65989c7dfc680 100644 --- a/net/mac80211/aes_cmac.c +++ b/net/mac80211/aes_cmac.c @@ -22,50 +22,77 @@
static const u8 zero[CMAC_TLEN_256];
-void ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad, - const u8 *data, size_t data_len, u8 *mic) +int ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad, + const u8 *data, size_t data_len, u8 *mic) { + int err; SHASH_DESC_ON_STACK(desc, tfm); u8 out[AES_BLOCK_SIZE]; const __le16 *fc;
desc->tfm = tfm;
- crypto_shash_init(desc); - crypto_shash_update(desc, aad, AAD_LEN); + err = crypto_shash_init(desc); + if (err) + return err; + err = crypto_shash_update(desc, aad, AAD_LEN); + if (err) + return err; fc = (const __le16 *)aad; if (ieee80211_is_beacon(*fc)) { /* mask Timestamp field to zero */ - crypto_shash_update(desc, zero, 8); - crypto_shash_update(desc, data + 8, data_len - 8 - CMAC_TLEN); + err = crypto_shash_update(desc, zero, 8); + if (err) + return err; + err = crypto_shash_update(desc, data + 8, + data_len - 8 - CMAC_TLEN); + if (err) + return err; } else { - crypto_shash_update(desc, data, data_len - CMAC_TLEN); + err = crypto_shash_update(desc, data, + data_len - CMAC_TLEN); + if (err) + return err; } - crypto_shash_finup(desc, zero, CMAC_TLEN, out); - + err = crypto_shash_finup(desc, zero, CMAC_TLEN, out); + if (err) + return err; memcpy(mic, out, CMAC_TLEN); + + return 0; }
-void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad, - const u8 *data, size_t data_len, u8 *mic) +int ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad, + const u8 *data, size_t data_len, u8 *mic) { + int err; SHASH_DESC_ON_STACK(desc, tfm); const __le16 *fc;
desc->tfm = tfm;
- crypto_shash_init(desc); - crypto_shash_update(desc, aad, AAD_LEN); + err = crypto_shash_init(desc); + if (err) + return err; + err = crypto_shash_update(desc, aad, AAD_LEN); + if (err) + return err; fc = (const __le16 *)aad; if (ieee80211_is_beacon(*fc)) { /* mask Timestamp field to zero */ - crypto_shash_update(desc, zero, 8); - crypto_shash_update(desc, data + 8, - data_len - 8 - CMAC_TLEN_256); + err = crypto_shash_update(desc, zero, 8); + if (err) + return err; + err = crypto_shash_update(desc, data + 8, + data_len - 8 - CMAC_TLEN_256); + if (err) + return err; } else { - crypto_shash_update(desc, data, data_len - CMAC_TLEN_256); + err = crypto_shash_update(desc, data, data_len - CMAC_TLEN_256); + if (err) + return err; } - crypto_shash_finup(desc, zero, CMAC_TLEN_256, mic); + return crypto_shash_finup(desc, zero, CMAC_TLEN_256, mic); }
struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[], diff --git a/net/mac80211/aes_cmac.h b/net/mac80211/aes_cmac.h index 76817446fb838..f74150542142a 100644 --- a/net/mac80211/aes_cmac.h +++ b/net/mac80211/aes_cmac.h @@ -11,10 +11,10 @@
struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[], size_t key_len); -void ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad, - const u8 *data, size_t data_len, u8 *mic); -void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad, - const u8 *data, size_t data_len, u8 *mic); +int ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad, + const u8 *data, size_t data_len, u8 *mic); +int ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad, + const u8 *data, size_t data_len, u8 *mic); void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm);
#endif /* AES_CMAC_H */ diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c index 40d5d9e484791..bb0fa505cdcae 100644 --- a/net/mac80211/wpa.c +++ b/net/mac80211/wpa.c @@ -869,8 +869,9 @@ ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) /* * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) */ - ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, - skb->data + 24, skb->len - 24, mmie->mic); + if (ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, + skb->data + 24, skb->len - 24, mmie->mic)) + return TX_DROP;
return TX_CONTINUE; } @@ -916,8 +917,9 @@ ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
/* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ - ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, - skb->data + 24, skb->len - 24, mmie->mic); + if (ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, + skb->data + 24, skb->len - 24, mmie->mic)) + return TX_DROP;
return TX_CONTINUE; } @@ -956,8 +958,9 @@ ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) if (!(status->flag & RX_FLAG_DECRYPTED)) { /* hardware didn't decrypt/verify MIC */ bip_aad(skb, aad); - ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, - skb->data + 24, skb->len - 24, mic); + if (ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, + skb->data + 24, skb->len - 24, mic)) + return RX_DROP_U_DECRYPT_FAIL; if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { key->u.aes_cmac.icverrors++; return RX_DROP_U_MIC_FAIL; @@ -1006,8 +1009,9 @@ ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) if (!(status->flag & RX_FLAG_DECRYPTED)) { /* hardware didn't decrypt/verify MIC */ bip_aad(skb, aad); - ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, - skb->data + 24, skb->len - 24, mic); + if (ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, + skb->data + 24, skb->len - 24, mic)) + return RX_DROP_U_DECRYPT_FAIL; if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { key->u.aes_cmac.icverrors++; return RX_DROP_U_MIC_FAIL;