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initialize pChildEnvSeg to 0 as if failed, callers would potentially free random memory address

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Kenneth J Davis 2025-03-28 17:03:58 -04:00
parent 868ae24d3c
commit 767cafa737
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1 changed files with 2 additions and 0 deletions
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kernel/task.c
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@ -139,10 +139,12 @@ STATIC COUNT ChildEnv(exec_blk * exp, UWORD * pChildEnvSeg, char far * pathname)
COUNT RetCode;
/* UWORD MaxEnvSize; not used -- 1999/04/21 ska */
psp FAR *ppsp = MK_FP(cu_psp, 0);
*pChildEnvSeg = 0; /* initialize to invalid value, prevent free'ing random address on errors by callers of ChildEnv */
/* create a new environment for the process */
/* copy parent's environment if exec.env_seg == 0 */
DebugPrintf(("ChildEnv: environment block is %u, using %s\n", exp->exec.env_seg, (exp->exec.env_seg)?"exec_blk":"parent_blk"));
pSrc = exp->exec.env_seg ?
MK_FP(exp->exec.env_seg, 0) : MK_FP(ppsp->ps_environ, 0);