Commit 3d042592ebd4 for kernel

commit 3d042592ebd4c7e44974d556de0b727cb7db4dab
Author: Chenguang Zhao <zhaochenguang@kylinos.cn>
Date:   Mon May 11 09:43:43 2026 +0800

    ethtool: fix ethnl_bitmap32_not_zero() bit interval semantics

    ethnl_bitmap32_not_zero() should return true if some bit in [start, end)
    is set:

    - Fix inverted memchr_inv() sense: return true when the scan finds a
      non-zero byte, not when the middle words are all zero.
    - Return false for an empty interval (end <= start).
    - When end is 32-bit aligned, indices in [start, end) do not include any
      bits from map[end_word]; return false after earlier checks found no
      non-zero data.

    Fixes: 10b518d4e6dd ("ethtool: netlink bitset handling")
    Signed-off-by: Chenguang Zhao <zhaochenguang@kylinos.cn>
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ethtool/bitset.c b/net/ethtool/bitset.c
index 8bb98d3ea3db..a3a2cc6480a0 100644
--- a/net/ethtool/bitset.c
+++ b/net/ethtool/bitset.c
@@ -92,7 +92,7 @@ static bool ethnl_bitmap32_not_zero(const u32 *map, unsigned int start,
 	u32 mask;

 	if (end <= start)
-		return true;
+		return false;

 	if (start % 32) {
 		mask = ethnl_upper_bits(start);
@@ -105,11 +105,11 @@ static bool ethnl_bitmap32_not_zero(const u32 *map, unsigned int start,
 		start_word++;
 	}

-	if (!memchr_inv(map + start_word, '\0',
-			(end_word - start_word) * sizeof(u32)))
+	if (memchr_inv(map + start_word, '\0',
+		       (end_word - start_word) * sizeof(u32)))
 		return true;
 	if (end % 32 == 0)
-		return true;
+		return false;
 	return map[end_word] & ethnl_lower_bits(end);
 }