There is a race condition on sequencecheck between th

sc_parent is transiently NULLed here: <p dir="aut

Race condition on sequencecheck about ipgen HOT 1 OPEN

ozaki-r commented on August 23, 2024

Race condition on sequencecheck

from ipgen.

Comments (1)

ozaki-r commented on August 23, 2024

sc_parent is transiently NULLed here:

ipgen/gen/sequencecheck.c

Lines 97 to 116 in 4e55696

    
           static void 
        
           seqcheck_init(struct sequencechecker *sc) 
        
           { 
        
           	memset(sc, 0, sizeof(*sc)); 
        
           	sc->sc_bitmap_start = 0; 
        
           	sc->sc_bitmap_end = sc->sc_bitmap_start + SEQ_MAXBIT; 
        
           	sc->sc_maxseq = 0; 
        
           	sc->sc_needinit = 1; 
        
           } 
        
           void 
        
           seqcheck_clear(struct sequencechecker *sc) 
        
           { 
        
           	struct sequencechecker *parent; 
        
           	parent = sc->sc_parent;	/* save */ 
        
           	seqcheck_init(sc); 
        
           	sc->sc_parent = parent;	/* restore */ 
        
           }

from ipgen.

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	static void
	seqcheck_init(struct sequencechecker *sc)
	{
	memset(sc, 0, sizeof(*sc));
	sc->sc_bitmap_start = 0;
	sc->sc_bitmap_end = sc->sc_bitmap_start + SEQ_MAXBIT;
	sc->sc_maxseq = 0;
	sc->sc_needinit = 1;
	}

	void
	seqcheck_clear(struct sequencechecker *sc)
	{
	struct sequencechecker *parent;
	parent = sc->sc_parent; /* save */

	seqcheck_init(sc);

	sc->sc_parent = parent; /* restore */
	}