This is a note to let you know that I've just added the patch titled nfc: pn533: prevent potential memory corruption to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nfc-pn533-prevent-potential-memory-corruption.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 695bf57b0812e8d0be572633211b1d9e96e14b2a Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Date: Fri Apr 2 14:44:42 2021 +0300 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@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> 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; }