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Fix stack memory usage for DMA in ath3k (rhbz 977558)

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This commit is contained in:
Josh Boyer 2013-06-27 09:36:48 -04:00
parent 69c0bf4782
commit 093a1632ec
2 changed files with 81 additions and 0 deletions
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72
ath3k-dont-use-stack-memory-for-DMA.patch Normal file
View File

@ -0,0 +1,72 @@
Memory allocated by vmalloc (including stack) can not be used for DMA,
i.e. data pointer on usb_control_msg() should not point to stack memory.
Resolves:
https://bugzilla.redhat.com/show_bug.cgi?id=977558
Reported-and-tested-by: Andy Lawrence <dr.diesel@gmail.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
drivers/bluetooth/ath3k.c | 38 +++++++++++++++++++++++++++++---------
1 file changed, 29 insertions(+), 9 deletions(-)
diff --git a/drivers/bluetooth/ath3k.c b/drivers/bluetooth/ath3k.c
index 11f467c..81b636c 100644
--- a/drivers/bluetooth/ath3k.c
+++ b/drivers/bluetooth/ath3k.c
@@ -193,24 +193,44 @@ error:
static int ath3k_get_state(struct usb_device *udev, unsigned char *state)
{
- int pipe = 0;
+ int ret, pipe = 0;
+ char *buf;
+
+ buf = kmalloc(1, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
pipe = usb_rcvctrlpipe(udev, 0);
- return usb_control_msg(udev, pipe, ATH3K_GETSTATE,
- USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
- state, 0x01, USB_CTRL_SET_TIMEOUT);
+ ret = usb_control_msg(udev, pipe, ATH3K_GETSTATE,
+ USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
+ buf, 1, USB_CTRL_SET_TIMEOUT);
+
+ *state = *buf;
+ kfree(buf);
+
+ return ret;
}
static int ath3k_get_version(struct usb_device *udev,
struct ath3k_version *version)
{
- int pipe = 0;
+ int ret, pipe = 0;
+ char *buf;
+ const int size = sizeof(struct ath3k_version);
+
+ buf = kmalloc(size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
pipe = usb_rcvctrlpipe(udev, 0);
- return usb_control_msg(udev, pipe, ATH3K_GETVERSION,
- USB_TYPE_VENDOR | USB_DIR_IN, 0, 0, version,
- sizeof(struct ath3k_version),
- USB_CTRL_SET_TIMEOUT);
+ ret = usb_control_msg(udev, pipe, ATH3K_GETVERSION,
+ USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
+ buf, size, USB_CTRL_SET_TIMEOUT);
+
+ memcpy(version, buf, size);
+ kfree(buf);
+
+ return ret;
}
static int ath3k_load_fwfile(struct usb_device *udev,
--
1.7.11.7

9
kernel.spec
View File

@ -785,6 +785,9 @@ Patch25052: HID-input-return-ENODATA-if-reading-battery-attrs-fails.patch
Patch25053: bridge-only-expire-the-mdb-entry-when-query-is-received.patch
Patch25054: bridge-send-query-as-soon-as-leave-is-received.patch
#rhbz 977558
Patch25055: ath3k-dont-use-stack-memory-for-DMA.patch
# END OF PATCH DEFINITIONS
%endif
@ -1498,6 +1501,9 @@ ApplyPatch HID-input-return-ENODATA-if-reading-battery-attrs-fails.patch
ApplyPatch bridge-only-expire-the-mdb-entry-when-query-is-received.patch
ApplyPatch bridge-send-query-as-soon-as-leave-is-received.patch
#rhbz 977558
ApplyPatch ath3k-dont-use-stack-memory-for-DMA.patch
# END OF PATCH APPLICATIONS
%endif
@ -2294,6 +2300,9 @@ fi
# ||----w |
# || ||
%changelog
* Thu Jun 27 2013 Josh Boyer <jwboyer@redhat.com>
- Fix stack memory usage for DMA in ath3k (rhbz 977558)
* Wed Jun 26 2013 Josh Boyer <jwboyer@redhat.com>
- Add two patches to fix bridge networking issues (rhbz 880035)