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lookup_one_len: don't accept . and ..

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-11-29 22:17:21 -05:00
commit 21d8a15ac3
1 changed files with 5 additions and 0 deletions
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5
fs/namei.c
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@ -2131,6 +2131,11 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
if (!len) if (!len)
return ERR_PTR(-EACCES); return ERR_PTR(-EACCES);
if (unlikely(name[0] == '.')) {
if (len < 2 || (len == 2 && name[1] == '.'))
return ERR_PTR(-EACCES);
}
while (len--) { while (len--) {
c = *(const unsigned char *)name++; c = *(const unsigned char *)name++;
if (c == '/' || c == '\0') if (c == '/' || c == '\0')