From: Anton Blanchard <anton@samba.org>
Date: Wed, 10 Aug 2011 20:44:24 +0000 (+0000)
Subject: powerpc: Fix oops when echoing bad values to /sys/devices/system/memory/probe
X-Git-Tag: v3.2-rc1~34^2~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a11940978bd598e65996b4f807cf4904793f7025;p=pandora-kernel.git

powerpc: Fix oops when echoing bad values to /sys/devices/system/memory/probe

If we echo an address the hypervisor doesn't like to
/sys/devices/system/memory/probe we oops the box:

# echo 0x10000000000 > /sys/devices/system/memory/probe

kernel BUG at arch/powerpc/mm/hash_utils_64.c:541!

The backtrace is:

create_section_mapping
arch_add_memory
add_memory
memory_probe_store
sysdev_class_store
sysfs_write_file
vfs_write
SyS_write

In create_section_mapping we BUG if htab_bolt_mapping returned
an error. A better approach is to return an error which will
propagate back to userspace.

Rerunning the test with this patch applied:

# echo 0x10000000000 > /sys/devices/system/memory/probe
-bash: echo: write error: Invalid argument

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable@kernel.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

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