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mm/mmap: use find_vma_intersection() in do_mmap() for overlap

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Using find_vma_intersection() avoids the need for a temporary variable and
makes the code cleaner.

Link: https://lkml.kernel.org/r/20210511014328.2902782-1-Liam.Howlett@Oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Liam Howlett 2021-06-28 19:38:44 -07:00 committed by Linus Torvalds
parent 96d990239e
commit 35e43c5ff4
1 changed files with 1 additions and 3 deletions
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4
mm/mmap.c
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@ -1457,9 +1457,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
return addr; return addr;
if (flags & MAP_FIXED_NOREPLACE) { if (flags & MAP_FIXED_NOREPLACE) {
struct vm_area_struct *vma = find_vma(mm, addr); if (find_vma_intersection(mm, addr, addr + len))
if (vma && vma->vm_start < addr + len)
return -EEXIST; return -EEXIST;
} }