From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: mpe@ellerman.id.au
Cc: Sachin Sant <sachinp@linux.vnet.ibm.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH] powerpc/pmem: Fix kernel crash due to wrong range value usage in flush_dcache_range
Date: Wed, 4 Dec 2019 10:59:09 +0530 [thread overview]
Message-ID: <20191204052909.59145-1-aneesh.kumar@linux.ibm.com> (raw)
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@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
arch/powerpc/mm/mem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index ad299e72ec30..9488b63dfc87 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -121,7 +121,7 @@ static void flush_dcache_range_chunked(unsigned long start, unsigned long stop,
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();
}
}
--
2.23.0
next reply other threads:[~2019-12-04 5:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-04 5:29 Aneesh Kumar K.V [this message]
2019-12-04 13:30 ` [PATCH] powerpc/pmem: Fix kernel crash due to wrong range value usage in flush_dcache_range Michael Ellerman
2019-12-04 13:48 ` Sachin Sant
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