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ntfs3: work around false-postive -Wmaybe-uninitialized warnings

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gcc sometimes fails to analyse how two local variables in ntfs_write_bh()
are initialized, as the initialization happens only in the first pass
through the main loop:

fs/ntfs3/fsntfs.c: In function 'ntfs_write_bh':
fs/ntfs3/fsntfs.c:1443:17: error: 'fixup' may be used uninitialized [-Werror=maybe-uninitialized]
 1443 |         __le16 *fixup;
      |                 ^~~~~
fs/ntfs3/fsntfs.c:1443:17: note: 'fixup' was declared here
 1443 |         __le16 *fixup;
      |                 ^~~~~
fs/ntfs3/fsntfs.c:1487:30: error: 'sample' may be used uninitialized [-Werror=maybe-uninitialized]
 1487 |                         *ptr = sample;
      |                         ~~~~~^~~~~~~~
fs/ntfs3/fsntfs.c:1444:16: note: 'sample' was declared here
 1444 |         __le16 sample;

Initializing the two variables to bogus values shuts up the warning and
makes it clear that those cannot be used. I tried rearranging the loop to
move the initialization in front of it, but couldn't quite figure it out.

Fixes: 48d9b57b16 ("fs/ntfs3: add a subset of W=1 warnings for stricter checks")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Arnd Bergmann
2026-03-12 17:49:33 +01:00
committed by Konstantin Komarov
parent d7ea8495fd
commit f9963deaa8
1 changed files with 2 additions and 2 deletions
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4
fs/ntfs3/fsntfs.c
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@@ -1440,8 +1440,8 @@ int ntfs_write_bh(struct ntfs_sb_info *sbi, struct NTFS_RECORD_HEADER *rhdr,
u16 fo = le16_to_cpu(rhdr->fix_off);
u16 fn = le16_to_cpu(rhdr->fix_num);
u32 idx;
__le16 *fixup;
__le16 sample;
__le16 *fixup = NULL;
__le16 sample = cpu_to_le16(-1u);
if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- ||
fn * SECTOR_SIZE > bytes) {