From: Kees Cook Date: Mon, 11 Oct 2010 18:28:16 +0000 (-0700) Subject: usb: iowarrior: don't trust report_size for buffer size X-Git-Tag: v2.6.37-rc1~154^2~31 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=3ed780117dbe5acb64280d218f0347f238dafed0;p=linux.git usb: iowarrior: don't trust report_size for buffer size If the iowarrior devices in this case statement support more than 8 bytes per report, it is possible to write past the end of a kernel heap allocation. This will probably never be possible, but change the allocation to be more defensive anyway. Signed-off-by: Kees Cook Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c index bc88c79875a1..8ed8d05750d4 100644 --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -374,7 +374,7 @@ static ssize_t iowarrior_write(struct file *file, case USB_DEVICE_ID_CODEMERCS_IOWPV2: case USB_DEVICE_ID_CODEMERCS_IOW40: /* IOW24 and IOW40 use a synchronous call */ - buf = kmalloc(8, GFP_KERNEL); /* 8 bytes are enough for both products */ + buf = kmalloc(count, GFP_KERNEL); if (!buf) { retval = -ENOMEM; goto exit;