linux-kernel - [PATCH][next] Bluetooth: hci_sync: Use cmd->num

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Date: Wed, 1 May 2024 11:50:02 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc: linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] Bluetooth: hci_sync: Use cmd->num_cis instead of magic
 number

At the moment of the check, `cmd->num_cis` holds the value of 0x1f,
which is the max number of elements in the `cmd->cis[]` array at
declaration, which is 0x1f.

So, avoid using 0x1f directly, and instead use `cmd->num_cis`. Similarly
to this other patch[1].

Link: https://lore.kernel.org/linux-hardening/ZivaHUQyDDK9fXEk@neat/ [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 net/bluetooth/hci_sync.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 6e15594d3565..af9513f3c451 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -6559,7 +6559,7 @@ int hci_le_create_cis_sync(struct hci_dev *hdev)
 		cis->cis_handle = cpu_to_le16(conn->handle);
 		aux_num_cis++;
 
-		if (aux_num_cis >= 0x1f)
+		if (aux_num_cis >= cmd->num_cis)
 			break;
 	}
 	cmd->num_cis = aux_num_cis;
-- 
2.34.1