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| author | Mattias Andrée <maandree@kth.se> | 2016-03-02 21:23:46 +0100 |
|---|---|---|
| committer | Mattias Andrée <maandree@kth.se> | 2016-03-02 21:23:53 +0100 |
| commit | e560794bea8451132e469793ec611c444d49205d (patch) | |
| tree | a27bc7dc035606b13e916084fc5aeff692cc3d47 | |
| parent | zgcd: optimisation of the first loop (diff) | |
| download | libzahl-e560794bea8451132e469793ec611c444d49205d.tar.gz libzahl-e560794bea8451132e469793ec611c444d49205d.tar.bz2 libzahl-e560794bea8451132e469793ec611c444d49205d.tar.xz | |
ztrunc: fix bug: bits > .used may lead to incorrect truncation
Signed-off-by: Mattias Andrée <maandree@kth.se>
| -rw-r--r-- | src/ztrunc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/ztrunc.c b/src/ztrunc.c index d4c31de..3d05c6e 100644 --- a/src/ztrunc.c +++ b/src/ztrunc.c @@ -16,6 +16,8 @@ ztrunc(z_t a, z_t b, size_t bits) chars = CEILING_BITS_TO_CHARS(bits); a->sign = b->sign; a->used = chars < b->used ? chars : b->used; + if (a->used < chars) + bits = 0; if (a->alloced < b->alloced) { a->alloced = b->alloced; a->chars = realloc(a->chars, b->alloced * sizeof(*(a->chars))); |