d40_of_probe() validates the memcpy-channels property against D40_MEMCPY_MAX_CHANS, but reads the property directly into dma40_memcpy_channels. That array has fewer entries, so a long property can overwrite adjacent data.
Validate the property length against ARRAY_SIZE(dma40_memcpy_channels) before reading it into the array. Reported-by: [email protected] Closes: https://lore.kernel.org/dmaengine/[email protected]/ Assisted-by: Codex:gpt-5-5 Signed-off-by: Linus Walleij <[email protected]> --- drivers/dma/ste_dma40.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 8cf73b37f8bf..4e840846466b 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -3470,7 +3470,8 @@ static int __init d40_of_probe(struct device *dev, list = of_get_property(np, "memcpy-channels", &num_memcpy); num_memcpy /= sizeof(*list); - if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) { + if (num_memcpy > ARRAY_SIZE(dma40_memcpy_channels) || + num_memcpy <= 0) { d40_err(dev, "Invalid number of memcpy channels specified (%d)\n", num_memcpy); -- 2.55.0
