Hello.
On 01-06-2012 12:06, Takashi Iwai wrote:
xhci_free_tt_info() may access the invalid memory when it removes the
last entry but the list is not empty. Then tt_next reaches to the
list head but it still tries to check the tt_info of that entry.
This patch fixes the bug and cleans up the messy code by rewriting
with a simple list_for_each_entry_safe().
Cc:<stable@xxxxxxxxxxxxxxx>
Reviewed-by: Oliver Neukum<oneukum@xxxxxxx>
Signed-off-by: Takashi Iwai<tiwai@xxxxxxx>
---
drivers/usb/host/xhci-mem.c | 38 +++++++++-----------------------------
1 file changed, 9 insertions(+), 29 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index ec4338e..4e1da7f 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
[...]
@@ -808,34 +807,15 @@ static void xhci_free_tt_info(struct xhci_hcd *xhci,
}
tt_list_head =&(xhci->rh_bw[virt_dev->real_port - 1].tts);
- if (list_empty(tt_list_head))
- return;
-
- list_for_each(tt, tt_list_head) {
- tt_info = list_entry(tt, struct xhci_tt_bw_info, tt_list);
- if (tt_info->slot_id == slot_id)
+ list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) {
+ /* Multi-TT hubs will have more than one entry */
+ if (tt_info->slot_id == slot_id) {
+ slot_found = true;
+ list_del(&tt_info->tt_list);
+ kfree(tt_info);
+ } else if (slot_found)
break;
'break' should be enclosed into {} according to CodingStyle.
WBR, Sergei
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