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| author | Takashi Iwai <tiwai@suse.de> | 2012-06-01 10:06:23 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-22 11:36:57 -0700 |
| commit | b063a624f08cfa64c2d9162d1525da95519e6156 (patch) | |
| tree | 8132a59deb1d636a81d32194b7f2b6a4d858f24f | |
| parent | d6bc383209efd8a57b3c73ef2524a98df32c7bcc (diff) | |
| download | linux-3.10-b063a624f08cfa64c2d9162d1525da95519e6156.tar.gz linux-3.10-b063a624f08cfa64c2d9162d1525da95519e6156.tar.bz2 linux-3.10-b063a624f08cfa64c2d9162d1525da95519e6156.zip | |
xhci: Fix invalid loop check in xhci_free_tt_info()
commit 46ed8f00d8982e49f8fe2c1a9cea192f640cb3ba upstream.
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().
This patch should be backported to kernels as old as 3.2, that contain
the commit 839c817ce67178ca3c7c7ad534c571bba1e69ebe "xhci: Store
information about roothubs and TTs."
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Reviewed-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/host/xhci-mem.c | 39 |
1 files changed, 10 insertions, 29 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 497ed7723e4..dab2f175296 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -793,10 +793,9 @@ static void xhci_free_tt_info(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, int slot_id) { - struct list_head *tt; struct list_head *tt_list_head; - struct list_head *tt_next; - struct xhci_tt_bw_info *tt_info; + struct xhci_tt_bw_info *tt_info, *next; + bool slot_found = false; /* If the device never made it past the Set Address stage, * it may not have the real_port set correctly. @@ -808,34 +807,16 @@ 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; + } } - /* Cautionary measure in case the hub was disconnected before we - * stored the TT information. - */ - if (tt_info->slot_id != slot_id) - return; - - tt_next = tt->next; - tt_info = list_entry(tt, struct xhci_tt_bw_info, - tt_list); - /* Multi-TT hubs will have more than one entry */ - do { - list_del(tt); - kfree(tt_info); - tt = tt_next; - if (list_empty(tt_list_head)) - break; - tt_next = tt->next; - tt_info = list_entry(tt, struct xhci_tt_bw_info, - tt_list); - } while (tt_info->slot_id == slot_id); } int xhci_alloc_tt_info(struct xhci_hcd *xhci, |