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job_unpost(): fix segfault

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This function could segfault under certain conditions (in macOS
Terminal, when ksh received SIGWINCH and a complex PS1 prompt is
defined; see 61437b27)

0   ksh            job_unpost + 49 (jobs.c:1703)
1   ksh            job_reap + 1632 (jobs.c:468)
2   ksh            job_wait + 942 (jobs.c:1525)
3   ksh            sh_exec + 19579 (xec.c:1627)
4   ksh            sh_eval + 545 (xec.c:763)
5   ksh            sh_trap + 427
6   ksh            ed_emacsread + 3598 (emacs.c:1072)
7   ksh            slowread + 489 (io.c:1962)
8   ksh            sfrd + 1026 (sfrd.c:253)
9   ksh            _sffilbuf + 587 (sffilbuf.c:105)
10  ksh            sfreserve + 662
11  ksh            exfile + 1922 (main.c:527)
12  ksh            sh_main + 1071 (main.c:351)
13  libdyld.dylib  start + 1

src/cmd/ksh93/sh/jobs.c: job_unpost():
- Fix a dereference of a possible null pointer returned by
  job_byjid(). Add a check and return if that pointer is null.
This commit is contained in:
Martijn Dekker 2021-01-18 06:59:29 +00:00
parent 7222ba3af7
commit 8361e065e6
1 changed files with 2 additions and 0 deletions
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2
src/cmd/ksh93/sh/jobs.c
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@ -1699,6 +1699,8 @@ static struct process *job_unpost(register struct process *pwtop,int notify)
sfsync(sfstderr);
#endif /* DEBUG */
pwtop = pw = job_byjid((int)pwtop->p_job);
if(!pw)
return(0);
#ifdef SHOPT_BGX
if(pw->p_flag&P_BG)
return(pw);