lookup_one_len: don't accept . and ..
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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0903a0c849
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21d8a15ac3
@ -2131,6 +2131,11 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
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if (!len)
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if (!len)
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return ERR_PTR(-EACCES);
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return ERR_PTR(-EACCES);
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if (unlikely(name[0] == '.')) {
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if (len < 2 || (len == 2 && name[1] == '.'))
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return ERR_PTR(-EACCES);
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}
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while (len--) {
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while (len--) {
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c = *(const unsigned char *)name++;
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c = *(const unsigned char *)name++;
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if (c == '/' || c == '\0')
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if (c == '/' || c == '\0')
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