__dentry_path() fixes
* we need to save the starting point for restarts * reject pathologically short buffers outright Spotted-by: Denys Vlasenko <dvlasenk@redhat.com> Spotted-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -3116,19 +3116,22 @@ char *simple_dname(struct dentry *dentry, char *buffer, int buflen)
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/*
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* Write full pathname from the root of the filesystem into the buffer.
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*/
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static char *__dentry_path(struct dentry *dentry, char *buf, int buflen)
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static char *__dentry_path(struct dentry *d, char *buf, int buflen)
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{
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struct dentry *dentry;
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char *end, *retval;
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int len, seq = 0;
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int error = 0;
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if (buflen < 2)
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goto Elong;
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rcu_read_lock();
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restart:
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dentry = d;
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end = buf + buflen;
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len = buflen;
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prepend(&end, &len, "\0", 1);
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if (buflen < 1)
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goto Elong;
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/* Get '/' right */
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retval = end-1;
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*retval = '/';
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