On Tue, Apr 14, 2020 at 11:42:48AM +0100, Mark Rutland wrote:
> The aarch32_vdso_pages[] array never has entries allocated in the C_VVAR
> or C_VDSO slots, and as the array is zero initialized these contain
> NULL.
>
> However in __aarch32_alloc_vdso_pages() when
> aarch32_alloc_kuser_vdso_page() fails we attempt to free the page whose
> struct page is at NULL, which is obviously nonsensical.
>
> This patch removes the erroneous page freeing.
>
> Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
I presume the cc stable should be limited to:
Fixes: 7c1deeeb0130 ("arm64: compat: VDSO setup for compat layer")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.3.x-
I'll fix it up locally.
--
Catalin
