genesi/linux-legacy
1
0
Fork 0
mirror of https://github.com/genesi/linux-legacy.git synced 2026-07-08 17:56:11 +00:00
Code Issues Packages Projects Releases Wiki Activity

USB: usbfs: only copy the actual data received

Browse Source 
commit d4a4683ca054ed9917dfc9e3ff0f7ecf74ad90d6 upstream

We need to only copy the data received by the device to userspace, not
the whole kernel buffer, which can contain "stale" data.

Thanks to Marcus Meissner for pointing this out and testing the fix.

Reported-by: Marcus Meissner <meissner@suse.de>
Tested-by: Marcus Meissner <meissner@suse.de>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Jeff Mahoney <jeffm@suse.com>
This commit is contained in:
Greg KH
2010-02-15 17:37:46 -08:00
committed by Greg Kroah-Hartman
parent 97fde87ccf
commit acbf8a1411
1 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/usb/core/devio.c
View File

@@ -1240,9 +1240,9 @@ static int processcompl(struct async *as, void __user * __user *arg)
void __user *addr = as->userurb;
unsigned int i;
if (as->userbuffer)
if (as->userbuffer && urb->actual_length)
if (copy_to_user(as->userbuffer, urb->transfer_buffer,
urb->transfer_buffer_length))
urb->actual_length))
goto err_out;
if (put_user(as->status, &userurb->status))
goto err_out;
@@ -1368,9 +1368,9 @@ static int processcompl_compat(struct async *as, void __user * __user *arg)
void __user *addr = as->userurb;
unsigned int i;
if (as->userbuffer)
if (as->userbuffer && urb->actual_length)
if (copy_to_user(as->userbuffer, urb->transfer_buffer,
urb->transfer_buffer_length))
urb->actual_length))
return -EFAULT;
if (put_user(as->status, &userurb->status))
return -EFAULT;