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namei: we never need more than MAXSYMLINKS entries in nd->stack

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The only reason why we needed one more was that purely nested
MAXSYMLINKS symlinks could lead to path_init() using that many
entries in addition to nd->stack[0] which it left unused.

That can't happen now - path_init() starts with entry 0 (and
trailing_symlink() is called only when we'd already encountered
one symlink, so no more than MAXSYMLINKS-1 are left).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-03 21:30:27 -04:00
parent 8eff733a45
commit e269f2a73f
1 changed files with 1 additions and 1 deletions
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2
fs/namei.c
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@ -528,7 +528,7 @@ static void restore_nameidata(struct nameidata *nd)
static int __nd_alloc_stack(struct nameidata *nd) static int __nd_alloc_stack(struct nameidata *nd)
{ {
struct saved *p = kmalloc((MAXSYMLINKS + 1) * sizeof(struct saved), struct saved *p = kmalloc(MAXSYMLINKS * sizeof(struct saved),
GFP_KERNEL); GFP_KERNEL);
if (unlikely(!p)) if (unlikely(!p))
return -ENOMEM; return -ENOMEM;