From 94014ff65bc2bdd752717792b156cdfcbc5b5c98 Mon Sep 17 00:00:00 2001 From: Peter Stephenson Date: Thu, 18 May 2017 09:33:08 +0100 Subject: 41113 (tweaked): Save current line linkage to history ring. When saving history state save whether the current history line is linked into the ring and remove it, and restore as appropriate later. This avoids surprises where the history ring is freed and incorrectly frees the current state in curline, which has a different allocation strategy. Original patch tweaked to make restoring more logical. --- ChangeLog | 6 ++++++ Src/hashtable.c | 1 + Src/hist.c | 42 +++++++++++++++++++++++++++--------------- Src/zsh.h | 1 + 4 files changed, 35 insertions(+), 15 deletions(-) diff --git a/ChangeLog b/ChangeLog index e608b167f..b5060864a 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2017-05-18 Peter Stephenson + + * 41113 (tweaked): Src/hashtable,c, Src/hist.c, Src/zsh.h: Save + and restore state of linking of current history line into history + ring, to avoid an attempt to free the current history line. + 2017-05-12 Jun-ichi Takimoto * 41090: Src/Zle/zle_refresh.c, Src/compat.c, Src/pattern.c, diff --git a/Src/hashtable.c b/Src/hashtable.c index ba5faad91..c34744cd8 100644 --- a/Src/hashtable.c +++ b/Src/hashtable.c @@ -1448,6 +1448,7 @@ freehistdata(Histent he, int unlink) if (!(he->node.flags & (HIST_DUP | HIST_TMPSTORE))) removehashnode(histtab, he->node.nam); + DPUTS(he->node.nam == chline, "Attempt to free chline in history data"); zsfree(he->node.nam); if (he->nwords) zfree(he->words, he->nwords*2*sizeof(short)); diff --git a/Src/hist.c b/Src/hist.c index 350688d2d..4c1039b67 100644 --- a/Src/hist.c +++ b/Src/hist.c @@ -87,6 +87,9 @@ mod_export zlong curhist; /**/ struct histent curline; +/***/ +int curline_linked; + /* current line count of allocated history entries */ /**/ @@ -261,6 +264,9 @@ hist_context_save(struct hist_stack *hs, int toplevel) */ hs->cstack = cmdstack; hs->csp = cmdsp; + hs->curline_linked = curline_linked; + + unlinkcurline(); stophist = 0; chline = NULL; @@ -300,6 +306,9 @@ hist_context_restore(const struct hist_stack *hs, int toplevel) zfree(cmdstack, CMDSTACKSZ); cmdstack = hs->cstack; cmdsp = hs->csp; + unlinkcurline(); + if (hs->curline_linked) + linkcurline(); } /* @@ -990,6 +999,7 @@ nohwe(void) /* these functions handle adding/removing curline to/from the hist_ring */ +/**/ static void linkcurline(void) { @@ -1002,11 +1012,15 @@ linkcurline(void) hist_ring = &curline; } curline.histnum = ++curhist; + curline_linked = 1; } +/**/ static void unlinkcurline(void) { + if (!curline_linked) + return; curline.up->down = curline.down; curline.down->up = curline.up; if (hist_ring == &curline) { @@ -1016,6 +1030,7 @@ unlinkcurline(void) hist_ring = curline.up; } curhist--; + curline_linked = 0; } /* initialize the history mechanism */ @@ -1035,6 +1050,7 @@ hbegin(int dohist) stophist = (!interact || unset(SHINSTDIN)) ? 2 : 0; else stophist = 0; + DPUTS(chline != NULL, "chline set at start of history"); /* * pws: We used to test for "|| (inbufflags & INP_ALIAS)" * in this test, but at this point we don't have input @@ -1292,11 +1308,10 @@ putoldhistentryontop(short keep_going) Histent prepnexthistent(void) { - Histent he; - int curline_in_ring = hist_ring == &curline; + Histent he; + int relink_curline = curline_linked; - if (curline_in_ring) - unlinkcurline(); + unlinkcurline(); if (hist_ring && hist_ring->node.flags & HIST_TMPSTORE) { curhist--; freehistnode(&hist_ring->node); @@ -1320,7 +1335,7 @@ prepnexthistent(void) he = hist_ring; } he->histnum = ++curhist; - if (curline_in_ring) + if (relink_curline) linkcurline(); return he; } @@ -1395,8 +1410,7 @@ hend(Eprog prog) queue_signals(); if (histdone & HISTFLAG_SETTY) settyinfo(&shttyinfo); - if (!(histactive & HA_NOINC)) - unlinkcurline(); + unlinkcurline(); if (histactive & HA_NOINC) { zfree(chline, hlinesz); zfree(chwords, chwordlen*sizeof(short)); @@ -3624,7 +3638,7 @@ int pushhiststack(char *hf, zlong hs, zlong shs, int level) { struct histsave *h; - int curline_in_ring = (histactive & HA_ACTIVE) && hist_ring == &curline; + int relink_curline = curline_linked; if (histsave_stack_pos == histsave_stack_size) { histsave_stack_size += 5; @@ -3632,8 +3646,7 @@ pushhiststack(char *hf, zlong hs, zlong shs, int level) histsave_stack_size * sizeof (struct histsave)); } - if (curline_in_ring) - unlinkcurline(); + unlinkcurline(); h = &histsave_stack[histsave_stack_pos++]; @@ -3668,7 +3681,7 @@ pushhiststack(char *hf, zlong hs, zlong shs, int level) savehistsiz = shs; inithist(); /* sets histtab */ - if (curline_in_ring) + if (relink_curline) linkcurline(); return histsave_stack_pos; @@ -3680,13 +3693,12 @@ int pophiststack(void) { struct histsave *h; - int curline_in_ring = (histactive & HA_ACTIVE) && hist_ring == &curline; + int relink_curline = curline_linked; if (histsave_stack_pos == 0) return 0; - if (curline_in_ring) - unlinkcurline(); + unlinkcurline(); deletehashtable(histtab); zsfree(lasthist.text); @@ -3709,7 +3721,7 @@ pophiststack(void) histsiz = h->histsiz; savehistsiz = h->savehistsiz; - if (curline_in_ring) + if (relink_curline) linkcurline(); return histsave_stack_pos + 1; diff --git a/Src/zsh.h b/Src/zsh.h index 22f73f806..405b27490 100644 --- a/Src/zsh.h +++ b/Src/zsh.h @@ -2931,6 +2931,7 @@ struct hist_stack { void (*addtoline) _((int)); unsigned char *cstack; int csp; + int curline_linked; }; /* -- cgit 1.4.1