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51670: prevent possible underflow in gettext()

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This commit is contained in:
Bart Schaefer 2023-04-22 14:40:23 -07:00
parent ba3631b414
commit 858b8de3d7
2 changed files with 5 additions and 1 deletions
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2
Src/text.c
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@ -335,7 +335,7 @@ getjobtext(Eprog prog, Wordcode c)
tlim = tptr + JOBTEXTSIZE - 1;
tjob = 1;
gettext2(&s);
if (tptr[-1] == Meta)
if (tptr > jbuf && tptr[-1] == Meta)
--tptr;
*tptr = '\0';
freeeprog(prog); /* mark as unused */