From: Philipp Hahn <phahn-oss@avm.de>
Date: Tue, 3 Mar 2026 10:59:14 +0000 (+0100)
Subject: exfat: Fix bitwise operation having different size
X-Git-Tag: v7.1-rc1~227^2~15
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=3dce5bb82c97fc2ac28d80d496120a6525ce3fb7;p=thirdparty%2Fkernel%2Flinux.git

exfat: Fix bitwise operation having different size

cpos has type loff_t (long long), while s_blocksize has type u32. The
inversion wil happen on u32, the coercion to s64 happens afterwards and
will do 0-left-paddding, resulting in the upper bits getting masked out.

Cast s_blocksize to loff_t before negating it.

Found by static code analysis using Klocwork.

Signed-off-by: Philipp Hahn <phahn-oss@avm.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---

diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index 3a4853693d8bf..e710dd196e2f0 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -249,7 +249,7 @@ get_new:
 		 */
 		if (err == -EIO) {
 			cpos += 1 << (sb->s_blocksize_bits);
-			cpos &= ~(sb->s_blocksize - 1);
+			cpos &= ~(loff_t)(sb->s_blocksize - 1);
 		}
 
 		err = -EIO;