[PATCH] powerpc/pmem: Fix kernel crash due to wrong range value usage in flush_dcache_range

[Michael Ellerman]

On Wed, 2019-12-04 at 05:29:09 UTC, "Aneesh Kumar K.V" wrote:
> This patch fix the below kernel crash.
> 
>  BUG: Unable to handle kernel data access on read at 0xc000000380000000
>  Faulting instruction address: 0xc00000000008b6f0
> cpu 0x5: Vector: 300 (Data Access) at [c0000000d8587790]
>     pc: c00000000008b6f0: arch_remove_memory+0x150/0x210
>     lr: c00000000008b720: arch_remove_memory+0x180/0x210
>     sp: c0000000d8587a20
>    msr: 800000000280b033
>    dar: c000000380000000
>  dsisr: 40000000
>   current = 0xc0000000d8558600
>   paca    = 0xc00000000fff8f00   irqmask: 0x03   irq_happened: 0x01
>     pid   = 1220, comm = ndctl
> enter ? for help
>  memunmap_pages+0x33c/0x410
>  devm_action_release+0x30/0x50
>  release_nodes+0x30c/0x3a0
>  device_release_driver_internal+0x178/0x240
>  unbind_store+0x74/0x190
>  drv_attr_store+0x44/0x60
>  sysfs_kf_write+0x74/0xa0
>  kernfs_fop_write+0x1b0/0x260
>  __vfs_write+0x3c/0x70
>  vfs_write+0xe4/0x200
>  ksys_write+0x7c/0x140
>  system_call+0x5c/0x68
> 
> Fixes: 076265907cf9 ("powerpc: Chunk calls to flush_dcache_range in arch_*_memory")
> Reported-by: Sachin Sant <sachinp at linux.vnet.ibm.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/6f4679b956741d2da6ad3ebb738cbe1264ac8781

cheers