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Pvm : Pvm analysis 1 : Null Pointer Dereference  at ddpro.c:894

Categories: LANG.MEM.NPD CWE:476
Warning ID: 2522.2553
Procedure: addhosts
Trace: View
Modified: Wed Sep 2 12:40:09 2009   show details
 
Priority: None
State: None
Finding: None
Owner: None
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Parse Error
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Two or More Loop Iterations
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Warning Location Contributes Parse Error
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Source  |  Language: C Hide Legend     
ProblemLineSource
   /u1/paul/SATE/2010/c/pvm/pvm3/src/ddpro.c
   Enter addhosts
 840 addhosts(mp, rmp) 
 841         struct pmsg *mp;        /* the request message */ 
 842         struct pmsg *rmp;       /* reply message blank */ 
 843 {
 844         struct hostd *hp, *hp2;
 845         struct pmsg *mp2;
 846         struct waitc *wp = 0;
 847         struct waitc_add *wxp = 0;
 848         int i, j;
 849         int count;
 850         int ngood;
 851         int ntid;
 852         struct hostent *he;
 853         int maxhostid = (tidhmask >> ffs(tidhmask) - 1);
 854         int hh;
 855         int pid;
 856         int *tids;
 857         char *winpvmdpath;
 858         char *pvmdpath;
 859         char *vmid;
 860         char *buf;
 861         int len;
 862  
 863         /*
 864         * have to lock this for 2 reasons:
 865         *  1. system can't handle overlapping host table updates,
 866         *  2. the new host tids aren't reserved 
 867         */ 
 868         if (busyadding) {
 869 /*
 870                 pvmlogerror("addhosts() already adding new hosts\n");
 871 */ 
 872                 pkint(rmp, PvmAlready);
 873                 sendmessage(rmp);
 874                 return 0;
 875         }
 876  
 877         busyadding = 1;
 878  
 879         /* sanity check count */ 
 880  
 881         if (upkint(mp, &count) || count < 1 || count > maxhostid) {
 882                 pvmlogerror("addhosts() bad msg format\n");
 883                 goto bad;
 884         }
 885  
 886         /*
 887         * make wait context, extract host list from message,
 888         */ 
 889  
 890         wp = wait_new(WT_HOSTSTART);
 891         wp->wa_tid = mp->m_src;
 892         wp->wa_dep = mp->m_wid;
true893         wxp = TALLOC(1, struct waitc_add, "waix");
wxp <= 4095894         wxp->w_num = count;     /* Null Pointer Dereference */
Preconditions 
&$unknown_330233 >= 1
busyadding = 0
Postconditions 
waitlist->wa_link->wa_rlink' = &$heap_22243
waitlist->wa_link->wa_rlink->wa_link' = &$heap_22243
busyadding' = 1
count' = &$unknown_330233
$heap_22243' = waitlist->wa_link
bytes_after(&$heap_22243)' = 80
$heap_22243' is allocated by malloc
$heap_22243' is allocated
bytes_before(&$heap_22243)' = 0
((char*)&$heap_22243)[20]' = 3
((char*)&$heap_22243)[24]' = 0
((char*)&$heap_22243)[56]' = 0
((char*)&$heap_22243)[64]' = 0
((char*)&$heap_22243)[72]' = 0
((char*)&$heap_22243)[8]' = waitlist->wa_link->wa_rlink
maxhostid' >= 1
maxhostid' >= &$unknown_330233
mp' = $param_1
rmp' = $param_2
wp' = &$heap_22243
wxp' = 0



Change Warning 2522.2553 : Null Pointer Dereference

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