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nfc: llcp: fix possible use of uninitialized variable in nfc_llcp_send_connect()

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[ Upstream commit 0d9b41daa5907756a31772d8af8ac5ff25cf17c1 ]

If sock->service_name is NULL, the local variable
service_name_tlv_length will not be assigned by nfc_llcp_build_tlv(),
later leading to using value frmo the stack.  Smatch warning:

  net/nfc/llcp_commands.c:442 nfc_llcp_send_connect() error: uninitialized symbol 'service_name_tlv_length'.

Fixes: de9e5aeb4f ("NFC: llcp: Fix usage of llcp_add_tlv()")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2023-05-13 13:52:04 +02:00 • committed by Greg Kroah-Hartman
commit 6ca0c94f2b
1 changed files with 2 additions and 1 deletions
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3
net/nfc/llcp_commands.c
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@ -394,7 +394,8 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
const u8 *service_name_tlv = NULL;
const u8 *miux_tlv = NULL;
const u8 *rw_tlv = NULL;
u8 service_name_tlv_length, miux_tlv_length, rw_tlv_length, rw;
u8 service_name_tlv_length = 0;
u8 miux_tlv_length, rw_tlv_length, rw;
int err;
u16 size = 0;
__be16 miux;