[PATCH 4.19 129/213] nfc: nci: Fix kcov check in nci_rx_work()

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>

[ Upstream commit 19e35f24750ddf860c51e51c68cf07ea181b4881 ]

Commit 7e8cdc97148c ("nfc: Add KCOV annotations") added
kcov_remote_start_common()/kcov_remote_stop() pair into nci_rx_work(),
with an assumption that kcov_remote_stop() is called upon continue of
the for loop. But commit d24b03535e5e ("nfc: nci: Fix uninit-value in
nci_dev_up and nci_ntf_packet") forgot to call kcov_remote_stop() before
break of the for loop.

Reported-by: syzbot <syzbot+0438378d6f157baae1a2@xxxxxxxxxxxxxxxxxxxxxxxxx>
Closes: https://syzkaller.appspot.com/bug?extid=0438378d6f157baae1a2
Fixes: d24b03535e5e ("nfc: nci: Fix uninit-value in nci_dev_up and nci_ntf_packet")
Suggested-by: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Link: https://lore.kernel.org/r/6d10f829-5a0c-405a-b39a-d7266f3a1a0b@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Stable-dep-of: 6671e352497c ("nfc: nci: Fix handling of zero-length payload packets in nci_rx_work()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/nfc/nci/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 6e83159b7b436..0e6bca80265ae 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1526,6 +1526,7 @@ static void nci_rx_work(struct work_struct *work)
 
 		if (!nci_valid_size(skb)) {
 			kfree_skb(skb);
+			kcov_remote_stop();
 			break;
 		}
 
-- 
2.43.0







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