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Bluetooth: btmtksdio: fix uninitialized symbol errors in btmtksdio_rx_packet

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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 <[email protected]>
Reported-by: Marcel Holtmann <[email protected]>
Signed-off-by: Sean Wang <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>
This commit is contained in:
Sean Wang 2019-03-19 04:58:33 +08:00 • committed by Marcel Holtmann
commit 637c8e9013
1 changed files with 0 additions and 10 deletions
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10
drivers/bluetooth/btmtksdio.c
View file

@ -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;