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-rw-r--r--net/ipv4/fib_trie.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index f0cdb30921c0..f84a0e90d675 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1550,7 +1550,8 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
* state.directly.
*/
if (pref_mismatch) {
- int mp = KEYLENGTH - fls(pref_mismatch);
+ /* fls(x) = __fls(x) + 1 */
+ int mp = KEYLENGTH - __fls(pref_mismatch) - 1;
if (tkey_extract_bits(cn->key, mp, cn->pos - mp) != 0)
goto backtrace;