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trap: fix use after free (#446)

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This commit adds a fix for the trap command, backported from a fork
of ksh2020: 2033375f

src/cmd/ksh93/sh/jobs.c: job_chldtrap():
- Fixed a use after free bug in the for loop. The string pointed to
  by sh.st.trapcom[SIGCHLD] may be freed from memory after
  sh_trap(), so it must be reobtained each time sh_trap() is called
  from within the for loop.
This commit is contained in:
Johnothan King 2022-02-04 18:29:23 -08:00 • committed by Martijn Dekker
parent 8e72608c1c
commit fb696ecfae
4 changed files with 14 additions and 5 deletions
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2
src/cmd/ksh93/include/jobs.h
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@ -170,7 +170,7 @@ extern int job_post(pid_t,pid_t);
extern void *job_subsave(void);
extern void job_subrestore(void*);
#if SHOPT_BGX
extern void job_chldtrap(const char*,int);
extern void job_chldtrap(int);
#endif /* SHOPT_BGX */
#ifdef JOBS
extern void job_init(int);