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Code Issues Releases Activity

(make_gap_larger): Make sure buffer size does not overflow range of int.

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This commit is contained in:
Andreas Schwab 2002-01-06 20:47:00 +00:00
parent b4ac0cdbf5
commit e17144de55
2 changed files with 11 additions and 3 deletions
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5
src/ChangeLog
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@ -1,3 +1,8 @@
2002-01-06 Andreas Schwab <schwab@suse.de>
* insdel.c (make_gap_larger): Make sure buffer size does not
overflow range of int.
2002-01-05 Jason Rumney <jasonr@gnu.org>
* w32term.c (x_draw_glyphs): Don't call notice_overwritten_cursor if

9
src/insdel.c
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@ -533,10 +533,13 @@ make_gap_larger (nbytes_added)
/* Don't allow a buffer size that won't fit in an int
even if it will fit in a Lisp integer.
That won't work because so many places use `int'. */
That won't work because so many places use `int'.
Make sure we don't introduce overflows in the calculation. */
if (Z_BYTE - BEG_BYTE + GAP_SIZE + nbytes_added
>= MOST_POSITIVE_FIXNUM)
if (Z_BYTE - BEG_BYTE + GAP_SIZE
>= (((EMACS_INT) 1 << (min (VALBITS, BITS_PER_INT) - 1)) - 1
- nbytes_added))
error ("Buffer exceeds maximum size");
enlarge_buffer_text (current_buffer, nbytes_added);