From: Mark Einon Date: Tue, 23 Sep 2014 19:41:11 +0000 (+0100) Subject: staging: et131x: zero allocation of fbr to prevent random address access X-Git-Tag: v3.18-rc1~130^2~220 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e112eb598db4fb7b99086c33765cf262dcfda0d2;p=karo-tx-linux.git staging: et131x: zero allocation of fbr to prevent random address access If et131x_rx_dma_memory_alloc() allocates rx_ring->fbr[0] but fails to allocate rx_ring->fbr[1], this leaves fbr[0]->ring_virtaddr with the possibility of being accessed in et131x_rx_dma_memory_free() as it contains a random value, potentially causing an oops. Fix this by zeroing the fbr memory on allocation. Subsequent frees of this fbr memory explicitly zeros the ring_virtaddr value. Reported-by: Tobias Klauser Signed-off-by: Mark Einon Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c index 93afd61f33fd..2889f86e6052 100644 --- a/drivers/staging/et131x/et131x.c +++ b/drivers/staging/et131x/et131x.c @@ -2003,10 +2003,10 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter) struct fbr_lookup *fbr; /* Alloc memory for the lookup table */ - rx_ring->fbr[0] = kmalloc(sizeof(*fbr), GFP_KERNEL); + rx_ring->fbr[0] = kzalloc(sizeof(*fbr), GFP_KERNEL); if (rx_ring->fbr[0] == NULL) return -ENOMEM; - rx_ring->fbr[1] = kmalloc(sizeof(*fbr), GFP_KERNEL); + rx_ring->fbr[1] = kzalloc(sizeof(*fbr), GFP_KERNEL); if (rx_ring->fbr[1] == NULL) return -ENOMEM;