This is a note to let you know that I've just added the patch titled
nfc: llcp: fix possible use of uninitialized variable in nfc_llcp_send_connect()
to the 4.19-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-llcp-fix-possible-use-of-uninitialized-variable-.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 994bdd8700413b10cf79b929542fa04709405edc
Author: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Date: Sat May 13 13:52:04 2023 +0200
nfc: llcp: fix possible use of uninitialized variable in nfc_llcp_send_connect()
[ 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: de9e5aeb4f40 ("NFC: llcp: Fix usage of llcp_add_tlv()")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/nfc/llcp_commands.c b/net/nfc/llcp_commands.c
index 6dcad7bcf20bb..737c7aa384f44 100644
--- a/net/nfc/llcp_commands.c
+++ b/net/nfc/llcp_commands.c
@@ -406,7 +406,8 @@ 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;
