diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2021-04-02 14:44:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-22 10:38:25 +0200 |
| commit | f1df51ff6b8e97871c5a0771f3715dc3a93daaaf (patch) | |
| tree | 1779ae1f960c8999304167c491706d072fe05b26 | |
| parent | 6682ee4724e4b3363c269adc50996768f938cedf (diff) | |
nfc: pn533: prevent potential memory corruption
[ Upstream commit ca4d4c34ae9aa5c3c0da76662c5e549d2fc0cc86 ]
If the "type_a->nfcid_len" is too large then it would lead to memory
corruption in pn533_target_found_type_a() when we do:
memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
Fixes: c3b1e1e8a76f ("NFC: Export NFCID1 from pn533")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/nfc/pn533.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c index bb3d5ea9869c..001c12867e43 100644 --- a/drivers/nfc/pn533.c +++ b/drivers/nfc/pn533.c @@ -1250,6 +1250,9 @@ static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a, if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0) return false; + if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE) + return false; + return true; } |