Mercurial > gnulib

diff lib/bitset/list.c @ 40240:d55c6147cb55

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
bitset: fix overflows Reported by Bruno Haible. https://lists.gnu.org/archive/html/bug-gnulib/2019-03/msg00017.html * lib/bitset/table.c (tbitset_test): last_bit is the position of the bit in the array of bitset_word, so be sure to take its modulo number-of-bits-in-bitset-word (i.e., EBITSET_ELT_WORDS). * lib/bitset/list.c (lbitset_unused_clear): Likewise.
author Akim Demaille <akim.demaille@gmail.com>
date Sat, 16 Mar 2019 17:16:48 +0100
parents b06060465f09
children
line wrap: on
line diff
--- a/lib/bitset/list.c	Thu Mar 14 08:31:54 2019 +0100
+++ b/lib/bitset/list.c	Sat Mar 16 17:16:48 2019 +0100
@@ -859,7 +859,8 @@
       bitset_word *srcp = elt->words;
       bitset_windex windex = n_bits / BITSET_WORD_BITS;
 
-      srcp[windex - elt->index] &= ((bitset_word) 1 << last_bit) - 1;
+      srcp[windex - elt->index]
+        &= ((bitset_word) 1 << (last_bit % BITSET_WORD_BITS)) - 1;
       windex++;
 
       for (; (windex - elt->index) < LBITSET_ELT_WORDS; windex++)