This is a note to let you know that I've just added the patch titled
powerpc/pmem: Fix kernel crash due to wrong range value usage in flush_dcache_range
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-pmem-fix-kernel-crash-due-to-wrong-range-value-usage-in-flush_dcache_range.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6f4679b956741d2da6ad3ebb738cbe1264ac8781 Mon Sep 17 00:00:00 2001
From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Date: Wed, 4 Dec 2019 10:59:09 +0530
Subject: powerpc/pmem: Fix kernel crash due to wrong range value usage in flush_dcache_range
From: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
commit 6f4679b956741d2da6ad3ebb738cbe1264ac8781 upstream.
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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20191204052909.59145-1-aneesh.kumar@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/mem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -120,7 +120,7 @@ static void flush_dcache_range_chunked(u
unsigned long i;
for (i = start; i < stop; i += chunk) {
- flush_dcache_range(i, min(stop, start + chunk));
+ flush_dcache_range(i, min(stop, i + chunk));
cond_resched();
}
}
Patches currently in stable-queue which might be from aneesh.kumar@xxxxxxxxxxxxx are
queue-5.4/powerpc-pmem-fix-kernel-crash-due-to-wrong-range-value-usage-in-flush_dcache_range.patch
