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| author | Ronald Wahl <ronald.wahl@raritan.com> | 2014-11-06 11:52:13 +0100 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2014-11-06 12:42:22 +0100 |
| commit | 4f031fa9f188b2b0641ac20087d9e16bcfb4e49d (patch) | |
| tree | f1214367a35c1a13b1a359020e67592046650da5 | |
| parent | mac80211: fix use-after-free in defragmentation (diff) | |
| download | linux-4f031fa9f188b2b0641ac20087d9e16bcfb4e49d.tar.xz linux-4f031fa9f188b2b0641ac20087d9e16bcfb4e49d.zip | |
mac80211: Fix regression that triggers a kernel BUG with CCMP
Commit 7ec7c4a9a686c608315739ab6a2b0527a240883c (mac80211: port CCMP to
cryptoapi's CCM driver) introduced a regression when decrypting empty
packets (data_len == 0). This will lead to backtraces like:
(scatterwalk_start) from [<c01312f4>] (scatterwalk_map_and_copy+0x2c/0xa8)
(scatterwalk_map_and_copy) from [<c013a5a0>] (crypto_ccm_decrypt+0x7c/0x25c)
(crypto_ccm_decrypt) from [<c032886c>] (ieee80211_aes_ccm_decrypt+0x160/0x170)
(ieee80211_aes_ccm_decrypt) from [<c031c628>] (ieee80211_crypto_ccmp_decrypt+0x1ac/0x238)
(ieee80211_crypto_ccmp_decrypt) from [<c032ef28>] (ieee80211_rx_handlers+0x870/0x1d24)
(ieee80211_rx_handlers) from [<c0330c7c>] (ieee80211_prepare_and_rx_handle+0x8a0/0x91c)
(ieee80211_prepare_and_rx_handle) from [<c0331260>] (ieee80211_rx+0x568/0x730)
(ieee80211_rx) from [<c01d3054>] (__carl9170_rx+0x94c/0xa20)
(__carl9170_rx) from [<c01d3324>] (carl9170_rx_stream+0x1fc/0x320)
(carl9170_rx_stream) from [<c01cbccc>] (carl9170_usb_tasklet+0x80/0xc8)
(carl9170_usb_tasklet) from [<c00199dc>] (tasklet_hi_action+0x88/0xcc)
(tasklet_hi_action) from [<c00193c8>] (__do_softirq+0xcc/0x200)
(__do_softirq) from [<c0019734>] (irq_exit+0x80/0xe0)
(irq_exit) from [<c0009c10>] (handle_IRQ+0x64/0x80)
(handle_IRQ) from [<c000c3a0>] (__irq_svc+0x40/0x4c)
(__irq_svc) from [<c0009d44>] (arch_cpu_idle+0x2c/0x34)
Such packets can appear for example when using the carl9170 wireless driver
because hardware sometimes generates garbage when the internal FIFO overruns.
This patch adds an additional length check.
Cc: stable@vger.kernel.org
Fixes: 7ec7c4a9a686 ("mac80211: port CCMP to cryptoapi's CCM driver")
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | net/mac80211/aes_ccm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/mac80211/aes_ccm.c b/net/mac80211/aes_ccm.c index ec24378caaaf..09d9caaec591 100644 --- a/net/mac80211/aes_ccm.c +++ b/net/mac80211/aes_ccm.c @@ -53,6 +53,9 @@ int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, __aligned(__alignof__(struct aead_request)); struct aead_request *aead_req = (void *) aead_req_data; + if (data_len == 0) + return -EINVAL; + memset(aead_req, 0, sizeof(aead_req_data)); sg_init_one(&pt, data, data_len); |