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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: c3b1e1e8a7 ("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>
This commit is contained in:
Dan Carpenter 2021-04-02 14:44:42 +03:00 committed by Greg Kroah-Hartman
parent efb0f45b45
commit cab33b3b6d
1 changed files with 3 additions and 0 deletions
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3
drivers/nfc/pn533/pn533.c
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@ -680,6 +680,9 @@ 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;
}