[PATCH 1/2] powerpc/pseries/msi: Fix potential underflow and leak issue

[Cédric Le Goater]

On 8/4/25 12:07, Nam Cao wrote:
> pseries_irq_domain_alloc() allocates interrupts at parent's interrupt
> domain. If it fails in the progress, all allocated interrupts are
> freed.
> 
> The number of successfully allocated interrupts so far is stored
> "i". However, "i - 1" interrupts are freed. This is broken:
> 
>    - One interrupt is not be freed
> 
>    - If "i" is zero, "i - 1" wraps around
> 
> Correct the number of freed interrupts to 'i'.
> 
> Fixes: a5f3d2c17b07 ("powerpc/pseries/pci: Add MSI domains")
> Signed-off-by: Nam Cao <namcao at linutronix.de>
> Cc: stable at vger.kernel.org
> ---
>   arch/powerpc/platforms/pseries/msi.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)



Reviewed-by: Cédric Le Goater <clg at redhat.com>

Thanks,

C.