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-rw-r--r--ipc/shm.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index b3048ebd5c31..7d86f058fb86 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1721,7 +1721,7 @@ long ksys_shmdt(char __user *shmaddr)
#ifdef CONFIG_MMU
loff_t size = 0;
struct file *file;
- struct vm_area_struct *next;
+ VMA_ITERATOR(vmi, mm, addr);
#endif
if (addr & ~PAGE_MASK)
@@ -1751,12 +1751,9 @@ long ksys_shmdt(char __user *shmaddr)
* match the usual checks anyway. So assume all vma's are
* above the starting address given.
*/
- vma = find_vma(mm, addr);
#ifdef CONFIG_MMU
- while (vma) {
- next = vma->vm_next;
-
+ for_each_vma(vmi, vma) {
/*
* Check if the starting address would match, i.e. it's
* a fragment created by mprotect() and/or munmap(), or it
@@ -1774,6 +1771,7 @@ long ksys_shmdt(char __user *shmaddr)
file = vma->vm_file;
size = i_size_read(file_inode(vma->vm_file));
do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL);
+ mas_pause(&vmi.mas);
/*
* We discovered the size of the shm segment, so
* break out of here and fall through to the next
@@ -1781,10 +1779,9 @@ long ksys_shmdt(char __user *shmaddr)
* searching for matching vma's.
*/
retval = 0;
- vma = next;
+ vma = vma_next(&vmi);
break;
}
- vma = next;
}
/*
@@ -1794,17 +1791,19 @@ long ksys_shmdt(char __user *shmaddr)
*/
size = PAGE_ALIGN(size);
while (vma && (loff_t)(vma->vm_end - addr) <= size) {
- next = vma->vm_next;
-
/* finding a matching vma now does not alter retval */
if ((vma->vm_ops == &shm_vm_ops) &&
((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) &&
- (vma->vm_file == file))
+ (vma->vm_file == file)) {
do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL);
- vma = next;
+ mas_pause(&vmi.mas);
+ }
+
+ vma = vma_next(&vmi);
}
#else /* CONFIG_MMU */
+ vma = vma_lookup(mm, addr);
/* under NOMMU conditions, the exact address to be destroyed must be
* given
*/