Staging: bcm: Add size maximum size restrictions for IOCTL_IDLE_REQ
In the first alteration, the MAX_CNTL_PKT_SIZE is the
maximum size of the control packet in ->Adapter->txctlpacket[]
which is defined in InitAdapter(). This caps the size of
kmalloc memory allocation. In the second change, this max
cap fixes a potential memory corruption bug when subsequent
memset and memcpy calls are invoked.
Signed-off-by: Kevin McKinney <klmckinney1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/bcm/Bcmchar.c b/drivers/staging/bcm/Bcmchar.c
index 1905a83..4c43353 100644
--- a/drivers/staging/bcm/Bcmchar.c
+++ b/drivers/staging/bcm/Bcmchar.c
@@ -690,6 +690,9 @@
if (IoBuffer.InputLength < sizeof(struct link_request))
return -EINVAL;
+ if (IoBuffer.InputLength > MAX_CNTL_PKT_SIZE)
+ return -EINVAL;
+
pvBuffer = kmalloc(IoBuffer.InputLength, GFP_KERNEL);
if (!pvBuffer)
return -ENOMEM;