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authorDan Carpenter <dan.carpenter@oracle.com>2021-04-02 14:44:42 +0300
committerDavid S. Miller <davem@davemloft.net>2021-04-02 14:27:50 -0700
commitca4d4c34ae9aa5c3c0da76662c5e549d2fc0cc86 (patch)
tree3c90130a8db3ff83082850e5349dc0e836006630 /drivers/nfc
parent8577dd8a07cc2183e3790aa8f8da3d8c6a87803d (diff)
nfc: pn533: prevent potential memory corruption
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>
Diffstat (limited to 'drivers/nfc')
-rw-r--r--drivers/nfc/pn533/pn533.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
index f1469ac8ff42..3fe5b81eda2d 100644
--- a/drivers/nfc/pn533/pn533.c
+++ b/drivers/nfc/pn533/pn533.c
@@ -706,6 +706,9 @@ 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;
}