Re: [PATCH v2] MIPS: Loongson64: env: Check UARTs passed by LEFI cautiously

[Thomas Bogendoerfer <tsbogend@alpha.franken.de>]

On Mon, Mar 16, 2026 at 01:28:22AM +0800, Rong Zhang wrote:
> Some firmware does not set nr_uarts properly and passes empty items.
> Iterate at most min(system->nr_uarts, MAX_UARTS) items to prevent
> out-of-bounds access, and ignore UARTs with addr 0 silently.
> 
> Meanwhile, our DT only works with UPIO_MEM but theoretically firmware
> may pass other IO types, so explicitly check against that.
> 
> Tested on Loongson-LS3A4000-7A1000-NUC-SE.
> 
> Fixes: 3989ed418483 ("MIPS: Loongson64: env: Fixup serial clock-frequency when using LEFI")
> Cc: stable@vger.kernel.org
> Reviewed-by: Yao Zi <me@ziyao.cc>
> Signed-off-by: Rong Zhang <rongrong@oss.cipunited.com>
> ---
> Changes in v2:
> - Sort new includes alphabetically (thanks Yao Zi)
> ---
>  arch/mips/loongson64/env.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)

applied to mips-fixes

Thomas.

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