linux-kernel - build failure of next-20221005 due to a3a956c78efa ("fs/ntfs3: Add option "nocase"")

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Date:   Wed, 5 Oct 2022 12:19:42 +0100
From:   "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>
To:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, ntfs3@...ts.linux.dev,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        linux-next@...r.kernel.org
Subject: build failure of next-20221005 due to a3a956c78efa ("fs/ntfs3: Add
 option "nocase"")

Hi All,

The builds of x86_84 allmodconfig with clang have failed to build
next-20221005 with the error:

fs/ntfs3/namei.c:445:7: error: variable 'uni1' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
                if (toupper(c1) != toupper(c2)) {
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~
./include/linux/ctype.h:64:20: note: expanded from macro 'toupper'
#define toupper(c) __toupper(c)
                   ^
fs/ntfs3/namei.c:487:12: note: uninitialized use occurs here
        __putname(uni1);
                  ^~~~
./include/linux/fs.h:2803:65: note: expanded from macro '__putname'
#define __putname(name)         kmem_cache_free(names_cachep, (void *)(name))
                                                                       ^~~~
fs/ntfs3/namei.c:445:3: note: remove the 'if' if its condition is always false
                if (toupper(c1) != toupper(c2)) {
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/ntfs3/namei.c:434:7: error: variable 'uni1' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
                if (!lm--) {
                    ^~~~~
fs/ntfs3/namei.c:487:12: note: uninitialized use occurs here
        __putname(uni1);
                  ^~~~
./include/linux/fs.h:2803:65: note: expanded from macro '__putname'
#define __putname(name)         kmem_cache_free(names_cachep, (void *)(name))
                                                                       ^~~~
fs/ntfs3/namei.c:434:3: note: remove the 'if' if its condition is always false
                if (!lm--) {
                ^~~~~~~~~~~~
fs/ntfs3/namei.c:430:22: note: initialize the variable 'uni1' to silence this warning
        struct cpu_str *uni1, *uni2;
                            ^
                             = NULL
2 errors generated.

git bisect pointed to a3a956c78efa ("fs/ntfs3: Add option "nocase"").

I will be happy to test any patch or provide any extra log if needed.


-- 
Regards
Sudip