[PATCH] powerpc/xive/spapr: correct bitmap allocation size

[Michael Ellerman]

On Thu, 23 Jun 2022 13:25:09 -0500, Nathan Lynch wrote:
> kasan detects access beyond the end of the xibm->bitmap allocation:
> 
> BUG: KASAN: slab-out-of-bounds in _find_first_zero_bit+0x40/0x140
> Read of size 8 at addr c00000001d1d0118 by task swapper/0/1
> 
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-rc2-00001-g90df023b36dd #28
> Call Trace:
> [c00000001d98f770] [c0000000012baab8] dump_stack_lvl+0xac/0x108 (unreliable)
> [c00000001d98f7b0] [c00000000068faac] print_report+0x37c/0x710
> [c00000001d98f880] [c0000000006902c0] kasan_report+0x110/0x354
> [c00000001d98f950] [c000000000692324] __asan_load8+0xa4/0xe0
> [c00000001d98f970] [c0000000011c6ed0] _find_first_zero_bit+0x40/0x140
> [c00000001d98f9b0] [c0000000000dbfbc] xive_spapr_get_ipi+0xcc/0x260
> [c00000001d98fa70] [c0000000000d6d28] xive_setup_cpu_ipi+0x1e8/0x450
> [c00000001d98fb30] [c000000004032a20] pSeries_smp_probe+0x5c/0x118
> [c00000001d98fb60] [c000000004018b44] smp_prepare_cpus+0x944/0x9ac
> [c00000001d98fc90] [c000000004009f9c] kernel_init_freeable+0x2d4/0x640
> [c00000001d98fd90] [c0000000000131e8] kernel_init+0x28/0x1d0
> [c00000001d98fe10] [c00000000000cd54] ret_from_kernel_thread+0x5c/0x64
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/xive/spapr: correct bitmap allocation size
      https://git.kernel.org/powerpc/c/19fc5bb93c6bbdce8292b4d7eed04e2fa118d2fe

cheers