diff options
Diffstat (limited to 'generic/tclAlloc.c')
| -rw-r--r-- | generic/tclAlloc.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/generic/tclAlloc.c b/generic/tclAlloc.c index de21c7c..04627a6 100644 --- a/generic/tclAlloc.c +++ b/generic/tclAlloc.c @@ -15,7 +15,7 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclAlloc.c,v 1.27 2007/12/17 15:28:27 msofer Exp $ + * RCS: @(#) $Id: tclAlloc.c,v 1.28 2009/09/29 05:03:46 dgp Exp $ */ /* @@ -265,7 +265,7 @@ TclpAlloc( register union overhead *overPtr; register long bucket; register unsigned amount; - struct block *bigBlockPtr; + struct block *bigBlockPtr = NULL; if (!allocInit) { /* @@ -281,9 +281,11 @@ TclpAlloc( * First the simple case: we simple allocate big blocks directly. */ - if (numBytes + OVERHEAD >= MAXMALLOC) { - bigBlockPtr = (struct block *) TclpSysAlloc((unsigned) - (sizeof(struct block) + OVERHEAD + numBytes), 0); + if (numBytes >= MAXMALLOC - OVERHEAD) { + if (numBytes <= UINT_MAX - OVERHEAD -sizeof(struct block)) { + bigBlockPtr = (struct block *) TclpSysAlloc((unsigned) + (sizeof(struct block) + OVERHEAD + numBytes), 0); + } if (bigBlockPtr == NULL) { Tcl_MutexUnlock(allocMutexPtr); return NULL; |