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51722: Safety for extracting elements of $historywords

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This commit is contained in:
Peter Stephenson 2023-05-13 21:49:07 +01:00
parent b4d1c756f5
commit a95198e268
2 changed files with 14 additions and 2 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2023-05-13 Peter Stephenson <p.w.stephenson@ntlworld.com>
* 51722: Src/Modules/parameter.c: Add safety to extracting
elements of $historywords.
2023-05-13 Oliver Kiddle <opk@zsh.org> 2023-05-13 Oliver Kiddle <opk@zsh.org>
* 51738: Doc/Zsh/mod_pcre.yo, Src/Modules/pcre.c, * 51738: Doc/Zsh/mod_pcre.yo, Src/Modules/pcre.c,

11
Src/Modules/parameter.c
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@ -1233,9 +1233,16 @@ histwgetfn(UNUSED(Param pm))
pushnode(l, getdata(n)); pushnode(l, getdata(n));
while (he) { while (he) {
char *hstr = he->node.nam;
int len = strlen(hstr);
for (iw = he->nwords - 1; iw >= 0; iw--) { for (iw = he->nwords - 1; iw >= 0; iw--) {
h = he->node.nam + he->words[iw * 2]; int wbegin = he->words[iw * 2];
e = he->node.nam + he->words[iw * 2 + 1]; int wend = he->words[iw * 2 + 1];
if (wbegin < 0 || wbegin >= len || wend < 0 || wend > len)
break;
h = hstr + wbegin;
e = hstr + wend;
sav = *e; sav = *e;
*e = '\0'; *e = '\0';
addlinknode(l, dupstring(h)); addlinknode(l, dupstring(h));