diff options
| author | Darrick J. Wong <djwong@kernel.org> | 2022-11-10 12:16:29 -0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-12-08 21:49:24 -0500 |
| commit | b76abb5157468756163fe7e3431c9fe32cba57ca (patch) | |
| tree | aa7af365db6a4810e277ed9fca58acb80021a8cc | |
| parent | 26d75a16af285a70863ba6a81f85d81e7e65da50 (diff) | |
ext4: dont return EINVAL from GETFSUUID when reporting UUID length
If userspace calls this ioctl with fsu_length (the length of the
fsuuid.fsu_uuid array) set to zero, ext4 copies the desired uuid length
out to userspace. The kernel call returned a result from a valid input,
so the return value here should be zero, not EINVAL.
While we're at it, fix the copy_to_user call to make it clear that we're
only copying out fsu_len.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Catherine Hoang <catherine.hoang@oracle.com>
Link: https://lore.kernel.org/r/166811138914.327006.9241306894437166566.stgit@magnolia
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
| -rw-r--r-- | fs/ext4/ioctl.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index e5f60057db5b..beedaebab21c 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -1154,9 +1154,10 @@ static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi, if (fsuuid.fsu_len == 0) { fsuuid.fsu_len = UUID_SIZE; - if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid.fsu_len))) + if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len, + sizeof(fsuuid.fsu_len))) return -EFAULT; - return -EINVAL; + return 0; } if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0) |