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| author | Paul Eggert <eggert@cs.ucla.edu> | 2011-07-28 18:10:08 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2011-07-28 18:10:08 -0700 |
| commit | 7d56f940979701a930cf9a7bc753fb9f39ce508b (patch) | |
| tree | 84c43a98f09f4fca9179e4ab2aac7f1391df53e0 /src/region-cache.c | |
| parent | bf2da747e95a3902bf715076aeee947d657c94cd (diff) | |
| download | emacs-7d56f940979701a930cf9a7bc753fb9f39ce508b.tar.gz | |
* region-cache.c (move_cache_gap): Check for size calculation overflow.
Diffstat (limited to 'src/region-cache.c')
| -rw-r--r-- | src/region-cache.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/region-cache.c b/src/region-cache.c index d701f4d71b0..e6cec96171d 100644 --- a/src/region-cache.c +++ b/src/region-cache.c @@ -247,11 +247,16 @@ move_cache_gap (struct region_cache *c, EMACS_INT pos, EMACS_INT min_size) if (gap_len < min_size) { EMACS_INT i; + ptrdiff_t cache_len_max = + min (PTRDIFF_MAX, SIZE_MAX) / sizeof *c->boundaries; + ptrdiff_t min_size_max = cache_len_max - c->cache_len; - /* Always make at least NEW_CACHE_GAP elements, as long as we're - expanding anyway. */ - if (min_size < NEW_CACHE_GAP) - min_size = NEW_CACHE_GAP; + if (min_size_max < min_size) + memory_full (SIZE_MAX); + + /* Unless running out of space, make at least NEW_CACHE_GAP + elements, as long as we're expanding anyway. */ + min_size = max (min_size, min (min_size_max, NEW_CACHE_GAP)); c->boundaries = (struct boundary *) xrealloc (c->boundaries, |