From 637c8e9013912f3161260bcaf74a184440aae363 Mon Sep 17 00:00:00 2001 From: Sean Wang Date: Tue, 19 Mar 2019 04:58:33 +0800 Subject: [PATCH] Bluetooth: btmtksdio: fix uninitialized symbol errors in btmtksdio_rx_packet MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fixed all the below warnings. They would probably cause the following error handling path would use the uninitialized value and then produce unexpected behavior. drivers/bluetooth/btmtksdio.c:470:2: warning: ‘old_len’ may be used uninitialized in this function [-Wmaybe-uninitialized] print_hex_dump(KERN_ERR, "err sdio rx: ", DUMP_PREFIX_NONE, 4, 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ old_data, old_len, true); ~~~~~~~~~~~~~~~~~~~~~~~~ drivers/bluetooth/btmtksdio.c:376:15: note: ‘old_len’ was declared here unsigned int old_len; ^~~~~~~ drivers/bluetooth/btmtksdio.c:470:2: warning: ‘old_data’ may be used uninitialized in this function [-Wmaybe-uninitialized] print_hex_dump(KERN_ERR, "err sdio rx: ", DUMP_PREFIX_NONE, 4, 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ old_data, old_len, true); ~~~~~~~~~~~~~~~~~~~~~~~~ drivers/bluetooth/btmtksdio.c:375:17: note: ‘old_data’ was declared here unsigned char *old_data; ^~~~~~~~ v2: Remove old_len and old_data because the error path for sdio_readsb also seems wrong. And change the prefix from "mediatek" to "btmtksdio". Fixes: d74eef2834b5 ("Bluetooth: mediatek: add support for MediaTek MT7663S and MT7668S SDIO devices") Reported-by: Dan Carpenter Reported-by: Marcel Holtmann Signed-off-by: Sean Wang Signed-off-by: Marcel Holtmann --- drivers/bluetooth/btmtksdio.c | 10 ---------- 1 file changed, 10 deletions(-) diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c index befe43f9a34a..7d0d1cb93b0e 100644 --- a/drivers/bluetooth/btmtksdio.c +++ b/drivers/bluetooth/btmtksdio.c @@ -372,8 +372,6 @@ static int btmtksdio_rx_packet(struct btmtksdio_dev *bdev, u16 rx_size) const struct h4_recv_pkt *pkts = mtk_recv_pkts; int pkts_count = ARRAY_SIZE(mtk_recv_pkts); struct mtkbtsdio_hdr *sdio_hdr; - unsigned char *old_data; - unsigned int old_len; int err, i, pad_size; struct sk_buff *skb; u16 dlen; @@ -392,12 +390,6 @@ static int btmtksdio_rx_packet(struct btmtksdio_dev *bdev, u16 rx_size) if (err < 0) goto err_kfree_skb; - /* Keep old data for dump the content in case of some error is - * caught in the following packet parsing. - */ - old_data = skb->data; - old_len = skb->len; - bdev->hdev->stat.byte_rx += rx_size; sdio_hdr = (void *)skb->data; @@ -467,8 +459,6 @@ static int btmtksdio_rx_packet(struct btmtksdio_dev *bdev, u16 rx_size) return 0; err_kfree_skb: - print_hex_dump(KERN_ERR, "err sdio rx: ", DUMP_PREFIX_NONE, 4, 1, - old_data, old_len, true); kfree_skb(skb); return err;