[PATCH 06/21] dmaengine: moxart-dma: Annotate struct moxart_desc with __counted_by

Kees Cook
2023-08-18T00:00:12Z

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct moxart_desc.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Vinod Koul <vkoul@kernel.org>
Cc: dmaengine@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/dma/moxart-dma.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/moxart-dma.c b/drivers/dma/moxart-dma.c
index 7565ad98ba66..c1dd5716a46d 100644
--- a/drivers/dma/moxart-dma.c
+++ b/drivers/dma/moxart-dma.c
@@ -124,7 +124,7 @@ struct moxart_desc {
unsigned int dma_cycles;
struct virt_dma_desc vd;
uint8_t es;
- struct moxart_sg sg[];
+ struct moxart_sg sg[] __counted_by(sglen);
};

struct moxart_chan {
@@ -309,6 +309,7 @@ static struct dma_async_tx_descriptor *moxart_prep_slave_sg(
d = kzalloc(struct_size(d, sg, sg_len), GFP_ATOMIC);
if (!d)
return NULL;
+ d->sglen = sg_len;

d->dma_dir = dir;
d->dev_addr = dev_addr;
@@ -319,8 +320,6 @@ static struct dma_async_tx_descriptor *moxart_prep_slave_sg(
d->sg[i].len = sg_dma_len(sgent);
}

- d->sglen = sg_len;
-
ch->error = 0;

return vchan_tx_prep(&ch->vc, &d->vd, tx_flags);
--
2.34.1