[bug #21823] Potential NULL pointer dereference on hash.c, hash_insert

[Marcio Buss]

URL:
  <http://savannah.gnu.org/bugs/?21823>

                 Summary: Potential NULL pointer dereference on hash.c,
hash_insert
                 Project: make
            Submitted by: marciobuss
            Submitted on: Tuesday 12/18/2007 at 03:18
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: None
           Fixed Release: None

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Details:


There's a potential null pointer dereference lurking at hash.c
line 132. The error can be tracked down as follows:

(1) Note the statement at line 131,
    const void *old_item = slot ? *slot : 0;

(2) then line 132 calls hash_insert_at (ht, item, slot)

(3) and hash_insert_at does
    const void *old_item = *(void **) slot;
    right away.

This means hash_insert_at cannot handle a NULL argument on its
third parameter, yet line 132 can potentially pass such value in.





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