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Bluetooth: Fix invalid-free in bcsp_close() 

Syzbot reported an invalid-free that I introduced fixing a memleak.

bcsp_recv() also frees bcsp->rx_skb but never nullifies its value.
Nullify bcsp->rx_skb every time it is freed.

Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com>
Reported-by: syzbot+a0d209a4676664613e76@syzkaller.appspotmail.com
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Tomas Bortoli 2019-11-01 21:42:44 +01:00 committed by Marcel Holtmann
parent 41d5b25fed
commit cf94da6f50
1 changed files with 3 additions and 0 deletions
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3
drivers/bluetooth/hci_bcsp.c
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@ -591,6 +591,7 @@ static int bcsp_recv(struct hci_uart *hu, const void *data, int count)
if (*ptr == 0xc0) { if (*ptr == 0xc0) {
BT_ERR("Short BCSP packet"); BT_ERR("Short BCSP packet");
kfree_skb(bcsp->rx_skb); kfree_skb(bcsp->rx_skb);
bcsp->rx_skb = NULL;
bcsp->rx_state = BCSP_W4_PKT_START; bcsp->rx_state = BCSP_W4_PKT_START;
bcsp->rx_count = 0; bcsp->rx_count = 0;
} else } else
@ -606,6 +607,7 @@ static int bcsp_recv(struct hci_uart *hu, const void *data, int count)
bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) { bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) {
BT_ERR("Error in BCSP hdr checksum"); BT_ERR("Error in BCSP hdr checksum");
kfree_skb(bcsp->rx_skb); kfree_skb(bcsp->rx_skb);
bcsp->rx_skb = NULL;
bcsp->rx_state = BCSP_W4_PKT_DELIMITER; bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
bcsp->rx_count = 0; bcsp->rx_count = 0;
continue; continue;
@ -630,6 +632,7 @@ static int bcsp_recv(struct hci_uart *hu, const void *data, int count)
bscp_get_crc(bcsp)); bscp_get_crc(bcsp));
kfree_skb(bcsp->rx_skb); kfree_skb(bcsp->rx_skb);
bcsp->rx_skb = NULL;
bcsp->rx_state = BCSP_W4_PKT_DELIMITER; bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
bcsp->rx_count = 0; bcsp->rx_count = 0;
continue; continue;