| Message ID | 20240716213830.work.951-kees@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dmaengine: stm32-dma3: Set lli_size after allocation | expand |
On 16/07/24 15:38, Kees Cook wrote: > With the new __counted_by annotation, the "lli_size" variable needs to > valid for accesses to the "lli" array. This requirement is not met in > stm32_dma3_chan_desc_alloc(), since "lli_size" starts at "0", so "lli" > index "0" will not be considered valid during the initialization for loop. > > Fix this by setting lli_size immediately after allocation (similar to > how this is handled in stm32_mdma_alloc_desc() for the node/count > relationship). > > Fixes: f561ec8b2b33 ("dmaengine: Add STM32 DMA3 support") > Signed-off-by: Kees Cook <kees@kernel.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Thanks
On Tue, 16 Jul 2024 14:38:33 -0700, Kees Cook wrote: > With the new __counted_by annotation, the "lli_size" variable needs to > valid for accesses to the "lli" array. This requirement is not met in > stm32_dma3_chan_desc_alloc(), since "lli_size" starts at "0", so "lli" > index "0" will not be considered valid during the initialization for loop. > > Fix this by setting lli_size immediately after allocation (similar to > how this is handled in stm32_mdma_alloc_desc() for the node/count > relationship). > > [...] Applied, thanks! [1/1] dmaengine: stm32-dma3: Set lli_size after allocation commit: b53b831919a0dc4e6631ebe0497ab2a4d8bef014 Best regards,
diff --git a/drivers/dma/stm32/stm32-dma3.c b/drivers/dma/stm32/stm32-dma3.c index 4087e0263a48..0be6e944df6f 100644 --- a/drivers/dma/stm32/stm32-dma3.c +++ b/drivers/dma/stm32/stm32-dma3.c @@ -403,6 +403,7 @@ static struct stm32_dma3_swdesc *stm32_dma3_chan_desc_alloc(struct stm32_dma3_ch swdesc = kzalloc(struct_size(swdesc, lli, count), GFP_NOWAIT); if (!swdesc) return NULL; + swdesc->lli_size = count; for (i = 0; i < count; i++) { swdesc->lli[i].hwdesc = dma_pool_zalloc(chan->lli_pool, GFP_NOWAIT, @@ -410,7 +411,6 @@ static struct stm32_dma3_swdesc *stm32_dma3_chan_desc_alloc(struct stm32_dma3_ch if (!swdesc->lli[i].hwdesc) goto err_pool_free; } - swdesc->lli_size = count; swdesc->ccr = 0; /* Set LL base address */
With the new __counted_by annotation, the "lli_size" variable needs to valid for accesses to the "lli" array. This requirement is not met in stm32_dma3_chan_desc_alloc(), since "lli_size" starts at "0", so "lli" index "0" will not be considered valid during the initialization for loop. Fix this by setting lli_size immediately after allocation (similar to how this is handled in stm32_mdma_alloc_desc() for the node/count relationship). Fixes: f561ec8b2b33 ("dmaengine: Add STM32 DMA3 support") Signed-off-by: Kees Cook <kees@kernel.org> --- Cc: "Amélie Delaunay" <amelie.delaunay@foss.st.com> Cc: Vinod Koul <vkoul@kernel.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: dmaengine@vger.kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com Cc: linux-arm-kernel@lists.infradead.org --- drivers/dma/stm32/stm32-dma3.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)