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linux-sg2042
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staging: r8712u: Fix leak of skb 

There are two types of messages queued for RX. The major type, which does
I/O on the device, was being handled properly. The skbs that communicated
with the firmware were being leaked.

While rewriting the code that sets up the skb, it was possible to remove
the private variable indicating that the old skb could be reused.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Larry Finger 2016-06-03 20:17:36 -05:00 committed by Greg Kroah-Hartman
parent 74a3b060bc
commit 78ece0b945
3 changed files with 8 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/staging/rtl8712/recv_linux.c
View File

@ -60,7 +60,6 @@ int r8712_os_recvbuf_resource_alloc(struct _adapter *padapter,
if (!precvbuf->purb)
res = _FAIL;
precvbuf->pskb = NULL;
precvbuf->reuse = false;
precvbuf->pallocated_buf = NULL;
precvbuf->pbuf = NULL;
precvbuf->pdata = NULL;

1
drivers/staging/rtl8712/rtl8712_recv.h
View File

@ -103,7 +103,6 @@ struct recv_buf {
struct _adapter *adapter;
struct urb *purb;
_pkt *pskb;
u8 reuse;
u8 irp_pending;
u32 transfer_len;
uint len;

24
drivers/staging/rtl8712/usb_ops_linux.c
View File

@ -202,26 +202,23 @@ static void r8712_usb_read_port_complete(struct urb *purb)
if (purb->status == 0) { /* SUCCESS */
if ((purb->actual_length > (MAX_RECVBUF_SZ)) ||
(purb->actual_length < RXDESC_SIZE)) {
precvbuf->reuse = true;
r8712_read_port(padapter, precvpriv->ff_hwaddr, 0,
(unsigned char *)precvbuf);
} else {
_pkt *pskb = precvbuf->pskb;
precvbuf->transfer_len = purb->actual_length;
pbuf = (uint *)precvbuf->pbuf;
isevt = le32_to_cpu(*(pbuf + 1)) & 0x1ff;
if ((isevt & 0x1ff) == 0x1ff) {
r8712_rxcmd_event_hdl(padapter, pbuf);
precvbuf->reuse = true;
skb_queue_tail(&precvpriv->rx_skb_queue, pskb);
r8712_read_port(padapter, precvpriv->ff_hwaddr,
0, (unsigned char *)precvbuf);
} else {
_pkt *pskb = precvbuf->pskb;
skb_put(pskb, purb->actual_length);
skb_queue_tail(&precvpriv->rx_skb_queue, pskb);
tasklet_hi_schedule(&precvpriv->recv_tasklet);
precvbuf->pskb = NULL;
precvbuf->reuse = false;
r8712_read_port(padapter, precvpriv->ff_hwaddr,
0, (unsigned char *)precvbuf);
}
@ -241,7 +238,6 @@ static void r8712_usb_read_port_complete(struct urb *purb)
}
/* Fall through. */
case -EPROTO:
precvbuf->reuse = true;
r8712_read_port(padapter, precvpriv->ff_hwaddr, 0,
(unsigned char *)precvbuf);
break;
@ -272,14 +268,11 @@ u32 r8712_usb_read_port(struct intf_hdl *pintfhdl, u32 addr, u32 cnt, u8 *rmem)
if (adapter->bDriverStopped || adapter->bSurpriseRemoved ||
adapter->pwrctrlpriv.pnp_bstop_trx || !precvbuf)
return _FAIL;
if (precvbuf->reuse || !precvbuf->pskb) {
precvbuf->pskb = skb_dequeue(&precvpriv->free_recv_skb_queue);
if (precvbuf->pskb != NULL)
precvbuf->reuse = true;
}
r8712_init_recvbuf(adapter, precvbuf);
/* re-assign for linux based on skb */
if (!precvbuf->reuse || !precvbuf->pskb) {
/* Try to use skb from the free queue */
precvbuf->pskb = skb_dequeue(&precvpriv->free_recv_skb_queue);
if (!precvbuf->pskb) {
precvbuf->pskb = netdev_alloc_skb(adapter->pnetdev,
MAX_RECVBUF_SZ + RECVBUFF_ALIGN_SZ);
if (!precvbuf->pskb)
@ -293,13 +286,12 @@ u32 r8712_usb_read_port(struct intf_hdl *pintfhdl, u32 addr, u32 cnt, u8 *rmem)
precvbuf->ptail = skb_tail_pointer(precvbuf->pskb);
precvbuf->pend = skb_end_pointer(precvbuf->pskb);
precvbuf->pbuf = precvbuf->pskb->data;
} else { /* reuse skb */
} else { /* skb is reused */
precvbuf->phead = precvbuf->pskb->head;
precvbuf->pdata = precvbuf->pskb->data;
precvbuf->ptail = skb_tail_pointer(precvbuf->pskb);
precvbuf->pend = skb_end_pointer(precvbuf->pskb);
precvbuf->pbuf = precvbuf->pskb->data;
precvbuf->reuse = false;
}
purb = precvbuf->purb;
/* translate DMA FIFO addr to pipehandle */