5.4-stable patches

added patches:
	powerpc-pmem-fix-kernel-crash-due-to-wrong-range-value-usage-in-flush_dcache_range.patch

diff --git a/queue-5.4/powerpc-pmem-fix-kernel-crash-due-to-wrong-range-value-usage-in-flush_dcache_range.patch b/queue-5.4/powerpc-pmem-fix-kernel-crash-due-to-wrong-range-value-usage-in-flush_dcache_range.patch
new file mode 100644 (file)
index 0000000..d9a1661
--- /dev/null
+++ b/queue-5.4/powerpc-pmem-fix-kernel-crash-due-to-wrong-range-value-usage-in-flush_dcache_range.patch
@@ -0,0 +1,59 @@
+From 6f4679b956741d2da6ad3ebb738cbe1264ac8781 Mon Sep 17 00:00:00 2001
+From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
+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@linux.ibm.com>
+
+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@linux.vnet.ibm.com>
+Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
+Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
+Link: https://lore.kernel.org/r/20191204052909.59145-1-aneesh.kumar@linux.ibm.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ 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();
+       }
+ }

diff --git a/queue-5.4/series b/queue-5.4/series
new file mode 100644 (file)
index 0000000..176012f
--- /dev/null
+++ b/queue-5.4/series
@@ -0,0 +1 @@
+powerpc-pmem-fix-kernel-crash-due-to-wrong-range-value-usage-in-flush_dcache_range.patch