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-rw-r--r--mm/madvise.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index 2221491ed50..deabe5f603a 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -13,6 +13,7 @@
#include <linux/hugetlb.h>
#include <linux/sched.h>
#include <linux/ksm.h>
+#include <linux/file.h>
/*
* Any behaviour which results in changes to the vma->vm_flags needs to
@@ -197,14 +198,16 @@ static long madvise_remove(struct vm_area_struct *vma,
struct address_space *mapping;
loff_t offset, endoff;
int error;
+ struct file *f;
*prev = NULL; /* tell sys_madvise we drop mmap_sem */
if (vma->vm_flags & (VM_LOCKED|VM_NONLINEAR|VM_HUGETLB))
return -EINVAL;
- if (!vma->vm_file || !vma->vm_file->f_mapping
- || !vma->vm_file->f_mapping->host) {
+ f = vma->vm_file;
+
+ if (!f || !f->f_mapping || !f->f_mapping->host) {
return -EINVAL;
}
@@ -218,9 +221,16 @@ static long madvise_remove(struct vm_area_struct *vma,
endoff = (loff_t)(end - vma->vm_start - 1)
+ ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
- /* vmtruncate_range needs to take i_mutex and i_alloc_sem */
+ /*
+ * vmtruncate_range may need to take i_mutex and i_alloc_sem.
+ * We need to explicitly grab a reference because the vma (and
+ * hence the vma's reference to the file) can go away as soon as
+ * we drop mmap_sem.
+ */
+ get_file(f);
up_read(&current->mm->mmap_sem);
error = vmtruncate_range(mapping->host, offset, endoff);
+ fput(f);
down_read(&current->mm->mmap_sem);
return error;
}