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Subject[PATCH 02/26] ia64: Use get_user_pages_fast() in err_inject.c
Date
Convert get_user_pages() call to get_user_pages_fast(). This actually
fixes an apparent bug where get_user_pages() has been called without
mmap_sem for an arbitrary user-provided address.

CC: Tony Luck <tony.luck@intel.com>
CC: linux-ia64@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
---
arch/ia64/kernel/err_inject.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c
index f59c0b844e88..75d35906a86b 100644
--- a/arch/ia64/kernel/err_inject.c
+++ b/arch/ia64/kernel/err_inject.c
@@ -142,8 +142,7 @@ store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
u64 virt_addr=simple_strtoull(buf, NULL, 16);
int ret;

- ret = get_user_pages(current, current->mm, virt_addr,
- 1, VM_READ, 0, NULL, NULL);
+ ret = get_user_pages_fast(virt_addr, 1, VM_READ, NULL);
if (ret<=0) {
#ifdef ERR_INJ_DEBUG
printk("Virtual address %lx is not existing.\n",virt_addr);
--
1.8.1.4


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