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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2014-09-01 20:27:29 +0300 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2014-09-05 00:57:32 +0200 |
| commit | d07f1e8600ccb885c8f4143402b8912f7d827bcb (patch) | |
| tree | 424bdab667951fb952c2cfe1951a1b028d1d0b59 /drivers/nfc/microread | |
| parent | 1bd3fa7b8c9b2936c16c6e6452f9cc991c405872 (diff) | |
| download | linux-d07f1e8600ccb885c8f4143402b8912f7d827bcb.tar.gz linux-d07f1e8600ccb885c8f4143402b8912f7d827bcb.tar.bz2 linux-d07f1e8600ccb885c8f4143402b8912f7d827bcb.zip | |
NFC: microread: Potential overflows in microread_target_discovered()
Smatch says that skb->data is untrusted so we need to check to make sure
that the memcpy() doesn't overflow.
Fixes: cfad1ba87150 ('NFC: Initial support for Inside Secure microread')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/nfc/microread')
| -rw-r--r-- | drivers/nfc/microread/microread.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/nfc/microread/microread.c b/drivers/nfc/microread/microread.c index f868333271aa..963a4a5dc88e 100644 --- a/drivers/nfc/microread/microread.c +++ b/drivers/nfc/microread/microread.c @@ -501,9 +501,13 @@ static void microread_target_discovered(struct nfc_hci_dev *hdev, u8 gate, targets->sens_res = be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A_ATQA]); targets->sel_res = skb->data[MICROREAD_EMCF_A_SAK]; - memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A_UID], - skb->data[MICROREAD_EMCF_A_LEN]); targets->nfcid1_len = skb->data[MICROREAD_EMCF_A_LEN]; + if (targets->nfcid1_len > sizeof(targets->nfcid1)) { + r = -EINVAL; + goto exit_free; + } + memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A_UID], + targets->nfcid1_len); break; case MICROREAD_GATE_ID_MREAD_ISO_A_3: targets->supported_protocols = @@ -511,9 +515,13 @@ static void microread_target_discovered(struct nfc_hci_dev *hdev, u8 gate, targets->sens_res = be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A3_ATQA]); targets->sel_res = skb->data[MICROREAD_EMCF_A3_SAK]; - memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A3_UID], - skb->data[MICROREAD_EMCF_A3_LEN]); targets->nfcid1_len = skb->data[MICROREAD_EMCF_A3_LEN]; + if (targets->nfcid1_len > sizeof(targets->nfcid1)) { + r = -EINVAL; + goto exit_free; + } + memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A3_UID], + targets->nfcid1_len); break; case MICROREAD_GATE_ID_MREAD_ISO_B: targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK; |