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| author | Kees Cook <keescook@chromium.org> | 2023-08-17 16:58:45 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2023-09-22 10:11:38 -0700 |
| commit | d30c4d7df4098bd6ada29da5ecaec66fb431ca10 (patch) | |
| tree | e5497a7b5685ce4839846fda97741da5ad48d1a3 | |
| parent | 6d1b27e425365c091058dc0cd87d4a6a35dc97e4 (diff) | |
| download | linux-d30c4d7df4098bd6ada29da5ecaec66fb431ca10.tar.gz linux-d30c4d7df4098bd6ada29da5ecaec66fb431ca10.tar.xz | |
dmaengine: sa11x0: Annotate struct sa11x0_dma_desc with __counted_by
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 sa11x0_dma_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
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230817235859.49846-8-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
| -rw-r--r-- | drivers/dma/sa11x0-dma.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/dma/sa11x0-dma.c b/drivers/dma/sa11x0-dma.c index a29c13cae716..e5849622f198 100644 --- a/drivers/dma/sa11x0-dma.c +++ b/drivers/dma/sa11x0-dma.c @@ -78,7 +78,7 @@ struct sa11x0_dma_desc { bool cyclic; unsigned sglen; - struct sa11x0_dma_sg sg[]; + struct sa11x0_dma_sg sg[] __counted_by(sglen); }; struct sa11x0_dma_phy; @@ -558,6 +558,7 @@ static struct dma_async_tx_descriptor *sa11x0_dma_prep_slave_sg( dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", &c->vc); return NULL; } + txd->sglen = j; j = 0; for_each_sg(sg, sgent, sglen, i) { @@ -593,7 +594,6 @@ static struct dma_async_tx_descriptor *sa11x0_dma_prep_slave_sg( txd->ddar = c->ddar; txd->size = size; - txd->sglen = j; dev_dbg(chan->device->dev, "vchan %p: txd %p: size %zu nr %u\n", &c->vc, &txd->vd, txd->size, txd->sglen); @@ -628,6 +628,7 @@ static struct dma_async_tx_descriptor *sa11x0_dma_prep_dma_cyclic( dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", &c->vc); return NULL; } + txd->sglen = sglen; for (i = k = 0; i < size / period; i++) { size_t tlen, len = period; @@ -653,7 +654,6 @@ static struct dma_async_tx_descriptor *sa11x0_dma_prep_dma_cyclic( txd->ddar = c->ddar; txd->size = size; - txd->sglen = sglen; txd->cyclic = 1; txd->period = sgperiod; |