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34543: Prevent crash on garbage bytes inside $(...)

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Garbage input (nul bytes, etc.) can cause the $(...) parser to become
confused during look-ahead and attempt to back up the input too far.
This commit catches the error but does not fix the underlying cause.
This commit is contained in:
Barton E. Schaefer 2015-02-14 10:43:10 -08:00
parent dd988542f4
commit 2c13d9fb0d
3 changed files with 13 additions and 4 deletions
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6
Src/input.c
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@ -393,12 +393,14 @@ inungetc(int c)
if (((inbufflags & INP_LINENO) || !strin) && c == '\n')
lineno--;
}
#ifdef DEBUG
else if (!(inbufflags & INP_CONT)) {
#ifdef DEBUG
/* Just for debugging */
fprintf(stderr, "Attempt to inungetc() at start of input.\n");
}
#endif
zerr("Garbled input at %c (binary file as commands?)", c);
return;
}
else {
/*
* The character is being backed up from a previous input stack