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fs/stat.c: avoid harmless garbage value problem in vfs_statx_path()

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Clang static checker(scan-build) warning:
fs/stat.c:287:21: warning: The left expression of the compound assignment is
an uninitialized value. The computed value will also be garbage.
  287 |                 stat->result_mask |= STATX_MNT_ID_UNIQUE;
      |                 ~~~~~~~~~~~~~~~~~ ^
fs/stat.c:290:21: warning: The left expression of the compound assignment is
an uninitialized value. The computed value will also be garbage.
  290 |                 stat->result_mask |= STATX_MNT_ID;

When vfs_getattr() failed because of security_inode_getattr(), 'stat' is
uninitialized. In this case, there is a harmless garbage problem in
vfs_statx_path(). It's better to return error directly when
vfs_getattr() failed, avoiding garbage value and more clearly.

Signed-off-by: Su Hui <suhui@nfschina.com>
Link: https://lore.kernel.org/r/20250119025946.1168957-1-suhui@nfschina.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Su Hui 2025-01-19 10:59:47 +08:00 committed by Christian Brauner
parent 2014c95afe
commit 0fac3ed473
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1 changed files with 3 additions and 1 deletions
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fs/stat.c
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@ -281,6 +281,8 @@ static int vfs_statx_path(struct path *path, int flags, struct kstat *stat,
u32 request_mask)
{
int error = vfs_getattr(path, stat, request_mask, flags);
if (error)
return error;
if (request_mask & STATX_MNT_ID_UNIQUE) {
stat->mnt_id = real_mount(path->mnt)->mnt_id_unique;
@ -302,7 +304,7 @@ static int vfs_statx_path(struct path *path, int flags, struct kstat *stat,
if (S_ISBLK(stat->mode))
bdev_statx(path, stat, request_mask);
return error;
return 0;
}
static int vfs_statx_fd(int fd, int flags, struct kstat *stat,