nfsd: Add a sanity check to SecinfoNoname for file type
Robert Morris reported that, for the case of SecinfoNoname with the Parent option, providing a non-directory could cause a crash. This patch adds a sanity check for v_type == VDIR for this case, to avoid the crash. Reported by: rtm@lcs.mit.edu PR: 260300 MFC after: 2 weeks
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@ -3822,6 +3822,11 @@ nfsrvd_secinfononame(struct nfsrv_descript *nd, int isdgram,
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fhstyle = fxdr_unsigned(int, *tl);
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switch (fhstyle) {
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case NFSSECINFONONAME_PARENT:
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if (dp->v_type != VDIR) {
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vput(dp);
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nd->nd_repstat = NFSERR_NOTDIR;
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goto nfsmout;
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}
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NFSNAMEICNDSET(&named.ni_cnd, nd->nd_cred, LOOKUP,
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LOCKLEAF | SAVESTART);
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nfsvno_setpathbuf(&named, &bufp, &hashp);
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