mm: shmem: use signed int for version handling in casefold option

Fixes an issue where the use of an unsigned data type in
`shmem_parse_opt_casefold()` caused incorrect evaluation of negative
conditions.

Link: https://lkml.kernel.org/r/20250111-unsignedcompare1601569-v3-1-c861b4221831@gmail.com
Fixes: 58e55efd6c72 ("tmpfs: Add casefold lookup support")
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Reviewed-by: Gabriel Krisman Bertazi <gabriel@krisman.be>
Signed-off-by: Karan Sanghavi <karansanghvi98@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Hugh Dickens <hughd@google.com>
Cc: Shuah khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index ac58d4fb2e6f5a617c85cd49de99e3c5f97209e6..fdb5afa1cfe9a6d402758880baa18c8aaccaa5fb 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4368,7 +4368,7 @@ static int shmem_parse_opt_casefold(struct fs_context *fc, struct fs_parameter *
                                    bool latest_version)
 {
        struct shmem_options *ctx = fc->fs_private;
-       unsigned int version = UTF8_LATEST;
+       int version = UTF8_LATEST;
        struct unicode_map *encoding;
        char *version_str = param->string + 5;