[PATCH 5.4 097/191] dmaengine: Fix access to uninitialized dma_slave_caps

From: Greg Kroah-Hartman
Date: Tue Jan 07 2020 - 16:25:40 EST

From: Lukas Wunner <lukas@xxxxxxxxx>

commit 53a256a9b925b47c7e67fc1f16ca41561a7b877c upstream.

dmaengine_desc_set_reuse() allocates a struct dma_slave_caps on the
stack, populates it using dma_get_slave_caps() and then accesses one
of its members.

However dma_get_slave_caps() may fail and this isn't accounted for,
leading to a legitimate warning of gcc-4.9 (but not newer versions):

In file included from drivers/spi/spi-bcm2835.c:19:0:
drivers/spi/spi-bcm2835.c: In function 'dmaengine_desc_set_reuse':
>> include/linux/dmaengine.h:1370:10: warning: 'caps.descriptor_reuse' is used uninitialized in this function [-Wuninitialized]
if (caps.descriptor_reuse) {

Fix it, thereby also silencing the gcc-4.9 warning.

The issue has been present for 4 years but surfaces only now that
the first caller of dmaengine_desc_set_reuse() has been added in
spi-bcm2835.c. Another user of reusable DMA descriptors has existed
for a while in pxa_camera.c, but it sets the DMA_CTRL_REUSE flag
directly instead of calling dmaengine_desc_set_reuse(). Nevertheless,
tag this commit for stable in case there are out-of-tree users.

Fixes: 272420214d26 ("dmaengine: Add DMA_CTRL_REUSE")
Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.3+
Link: https://lore.kernel.org/r/ca92998ccc054b4f2bfd60ef3adbab2913171eac.1575546234.git.lukas@xxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

include/linux/dmaengine.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1364,8 +1364,11 @@ static inline int dma_get_slave_caps(str
static inline int dmaengine_desc_set_reuse(struct dma_async_tx_descriptor *tx)
struct dma_slave_caps caps;
+ int ret;

- dma_get_slave_caps(tx->chan, &caps);
+ ret = dma_get_slave_caps(tx->chan, &caps);
+ if (ret)
+ return ret;

if (caps.descriptor_reuse) {
tx->flags |= DMA_CTRL_REUSE;