>From b77facc21fccd909c204807767f4ddc05a10afdb Mon Sep 17 00:00:00 2001 From: Kevin McKinney <klmckinney1@xxxxxxxxx> Date: Sat, 3 Sep 2011 15:02:18 -0400 Subject: [PATCH 1/2] Staging: bcm: Add size minimum size restrictions for IOCTL_IDLE_REQ If IoBuffer.InputLength is zero then this will cause an Oops when we dereference the ZERO_SIZE_PTR. Or if it's smaller than sizeof(struct link_request) then we would get memory corruption when we set ->PLength in CopyBufferToControlPacket() Signed-off-by: Kevin McKinney <klmckinney1@xxxxxxxxx> --- drivers/staging/bcm/Bcmchar.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/drivers/staging/bcm/Bcmchar.c b/drivers/staging/bcm/Bcmchar.c index 6f8a75d..1905a83 100644 --- a/drivers/staging/bcm/Bcmchar.c +++ b/drivers/staging/bcm/Bcmchar.c @@ -687,7 +687,9 @@ static long bcm_char_ioctl(struct file *filp, UINT cmd, ULONG arg) if (copy_from_user(&IoBuffer, argp, sizeof(IOCTL_BUFFER))) return -EFAULT; - /* FIXME: don't accept any length from user */ + if (IoBuffer.InputLength < sizeof(struct link_request)) + return -EINVAL; + pvBuffer = kmalloc(IoBuffer.InputLength, GFP_KERNEL); if (!pvBuffer) return -ENOMEM; -- 1.7.4.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
