linux/drivers/dma/dmaengine.c
Nuno Sá 92f853f064 dmaengine: Fix possible use after free
In dma_release_channel(), check chan->device->privatecnt after call
dma_chan_put(). However, dma_chan_put() call dma_device_put() which could
release the last reference of the device if the DMA provider is already
gone and hence free it.

Fixes it by moving dma_chan_put() after the check.

Fixes: 0f571515c3 ("dmaengine: Add privatecnt to revert DMA_PRIVATE property")
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260424-dma-dmac-handle-vunmap-v4-1-90f43412fdc0@analog.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2026-06-08 17:37:06 +05:30

1638 lines
40 KiB