struct ext4_fsmap_head is the ext4 internal fsmap representation of struct fsmap_head. As the code was, the fmh_iflags validation was done on the fmh_iflags value of the internal fsmap representation. Since xhead.fmh_iflags is initialized with head.fmh_iflags and not changed afterwards, do the validation of fmh_iflags directly on fsmap_head data, it spares some superfluous initializations in case the user provides a wrong value for fmh_iflags. Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx> --- v2: new patch fs/ext4/fsmap.c | 2 -- fs/ext4/ioctl.c | 2 ++ 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ext4/fsmap.c b/fs/ext4/fsmap.c index cdf9bfe10137..7765293bfa5d 100644 --- a/fs/ext4/fsmap.c +++ b/fs/ext4/fsmap.c @@ -635,8 +635,6 @@ int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head, int i; int error = 0; - if (head->fmh_iflags & ~FMH_IF_VALID) - return -EINVAL; if (!ext4_getfsmap_is_valid_device(sb, &head->fmh_keys[0]) || !ext4_getfsmap_is_valid_device(sb, &head->fmh_keys[1])) return -EINVAL; diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 2b412f1cbc10..77b0198a0f48 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -873,6 +873,8 @@ static int ext4_ioc_getfsmap(struct super_block *sb, if (copy_from_user(&head, arg, sizeof(struct fsmap_head))) return -EFAULT; + if (head.fmh_iflags & ~FMH_IF_VALID) + return -EINVAL; if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) || memchr_inv(head.fmh_keys[0].fmr_reserved, 0, sizeof(head.fmh_keys[0].fmr_reserved)) || -- 2.40.0.rc1.284.g88254d51c5-goog
