| Message ID | 20200902144059.284726-4-cmaiolino@redhat.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | Clean up xfs_attr_sf_entry | expand |
On Wed, Sep 02, 2020 at 04:40:58PM +0200, Carlos Maiolino wrote: > nameval is a variable-size array, so, define it as it, and remove all > the -1 magic number subtractions > > Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> > --- > Changelog: > > V2: > - Drop wrong change to XFS_ATTR_SF_ENTSIZE_MAX > > fs/xfs/libxfs/xfs_attr_leaf.c | 6 ++---- > fs/xfs/libxfs/xfs_attr_sf.h | 4 ++-- > fs/xfs/libxfs/xfs_da_format.h | 2 +- > 3 files changed, 5 insertions(+), 7 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c > index d920183b08a99..89193871e6a7f 100644 > --- a/fs/xfs/libxfs/xfs_attr_leaf.c > +++ b/fs/xfs/libxfs/xfs_attr_leaf.c > @@ -992,7 +992,7 @@ xfs_attr_shortform_allfit( > return 0; > if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX) > return 0; > - bytes += sizeof(struct xfs_attr_sf_entry) - 1 > + bytes += sizeof(struct xfs_attr_sf_entry) > + name_loc->namelen > + be16_to_cpu(name_loc->valuelen); Isn't this an open-coded: bytes += XFS_ATTR_SF_ENTSIZE_BYNAME(name_loc->namelen, be16_to_cpu(name_loc->valuelen)); Otherwise this patch looks ok to me. --D > } > @@ -1036,10 +1036,8 @@ xfs_attr_shortform_verify( > * struct xfs_attr_sf_entry has a variable length. > * Check the fixed-offset parts of the structure are > * within the data buffer. > - * xfs_attr_sf_entry is defined with a 1-byte variable > - * array at the end, so we must subtract that off. > */ > - if (((char *)sfep + sizeof(*sfep) - 1) >= endp) > + if (((char *)sfep + sizeof(*sfep)) >= endp) > return __this_address; > > /* Don't allow names with known bad length. */ > diff --git a/fs/xfs/libxfs/xfs_attr_sf.h b/fs/xfs/libxfs/xfs_attr_sf.h > index c4afb33079184..f608a2966d7f8 100644 > --- a/fs/xfs/libxfs/xfs_attr_sf.h > +++ b/fs/xfs/libxfs/xfs_attr_sf.h > @@ -27,11 +27,11 @@ typedef struct xfs_attr_sf_sort { > } xfs_attr_sf_sort_t; > > #define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen) /* space name/value uses */ \ > - (((int)sizeof(struct xfs_attr_sf_entry)-1 + (nlen)+(vlen))) > + (((int)sizeof(struct xfs_attr_sf_entry) + (nlen)+(vlen))) > #define XFS_ATTR_SF_ENTSIZE_MAX /* max space for name&value */ \ > ((1 << (NBBY*(int)sizeof(uint8_t))) - 1) > #define XFS_ATTR_SF_ENTSIZE(sfep) /* space an entry uses */ \ > - ((int)sizeof(struct xfs_attr_sf_entry)-1 + \ > + ((int)sizeof(struct xfs_attr_sf_entry) + \ > (sfep)->namelen+(sfep)->valuelen) > #define XFS_ATTR_SF_NEXTENTRY(sfep) /* next entry in struct */ \ > ((struct xfs_attr_sf_entry *)((char *)(sfep) + \ > diff --git a/fs/xfs/libxfs/xfs_da_format.h b/fs/xfs/libxfs/xfs_da_format.h > index e708b714bf99d..b40a4e80f5ee6 100644 > --- a/fs/xfs/libxfs/xfs_da_format.h > +++ b/fs/xfs/libxfs/xfs_da_format.h > @@ -589,7 +589,7 @@ struct xfs_attr_shortform { > uint8_t namelen; /* actual length of name (no NULL) */ > uint8_t valuelen; /* actual length of value (no NULL) */ > uint8_t flags; /* flags bits (see xfs_attr_leaf.h) */ > - uint8_t nameval[1]; /* name & value bytes concatenated */ > + uint8_t nameval[]; /* name & value bytes concatenated */ > } list[1]; /* variable sized array */ > }; > > -- > 2.26.2 >
On Wed, Sep 02, 2020 at 04:40:58PM +0200, Carlos Maiolino wrote: > nameval is a variable-size array, so, define it as it, and remove all > the -1 magic number subtractions Looks good, but two little style nitpicks below. Reviewed-by: Christoph Hellwig <hch@lst.de> > if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX) > return 0; > - bytes += sizeof(struct xfs_attr_sf_entry) - 1 > + bytes += sizeof(struct xfs_attr_sf_entry) > + name_loc->namelen > + be16_to_cpu(name_loc->valuelen); This can be condensed to: bytes += sizeof(struct xfs_attr_sf_entry) + name_loc->namelen + be16_to_cpu(name_loc->valuelen); > index c4afb33079184..f608a2966d7f8 100644 > --- a/fs/xfs/libxfs/xfs_attr_sf.h > +++ b/fs/xfs/libxfs/xfs_attr_sf.h > @@ -27,11 +27,11 @@ typedef struct xfs_attr_sf_sort { > } xfs_attr_sf_sort_t; > > #define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen) /* space name/value uses */ \ > - (((int)sizeof(struct xfs_attr_sf_entry)-1 + (nlen)+(vlen))) > + (((int)sizeof(struct xfs_attr_sf_entry) + (nlen)+(vlen))) We can drop the int cast, but more importantly please add whitespaces before and after the + operator.
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c index d920183b08a99..89193871e6a7f 100644 --- a/fs/xfs/libxfs/xfs_attr_leaf.c +++ b/fs/xfs/libxfs/xfs_attr_leaf.c @@ -992,7 +992,7 @@ xfs_attr_shortform_allfit( return 0; if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX) return 0; - bytes += sizeof(struct xfs_attr_sf_entry) - 1 + bytes += sizeof(struct xfs_attr_sf_entry) + name_loc->namelen + be16_to_cpu(name_loc->valuelen); } @@ -1036,10 +1036,8 @@ xfs_attr_shortform_verify( * struct xfs_attr_sf_entry has a variable length. * Check the fixed-offset parts of the structure are * within the data buffer. - * xfs_attr_sf_entry is defined with a 1-byte variable - * array at the end, so we must subtract that off. */ - if (((char *)sfep + sizeof(*sfep) - 1) >= endp) + if (((char *)sfep + sizeof(*sfep)) >= endp) return __this_address; /* Don't allow names with known bad length. */ diff --git a/fs/xfs/libxfs/xfs_attr_sf.h b/fs/xfs/libxfs/xfs_attr_sf.h index c4afb33079184..f608a2966d7f8 100644 --- a/fs/xfs/libxfs/xfs_attr_sf.h +++ b/fs/xfs/libxfs/xfs_attr_sf.h @@ -27,11 +27,11 @@ typedef struct xfs_attr_sf_sort { } xfs_attr_sf_sort_t; #define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen) /* space name/value uses */ \ - (((int)sizeof(struct xfs_attr_sf_entry)-1 + (nlen)+(vlen))) + (((int)sizeof(struct xfs_attr_sf_entry) + (nlen)+(vlen))) #define XFS_ATTR_SF_ENTSIZE_MAX /* max space for name&value */ \ ((1 << (NBBY*(int)sizeof(uint8_t))) - 1) #define XFS_ATTR_SF_ENTSIZE(sfep) /* space an entry uses */ \ - ((int)sizeof(struct xfs_attr_sf_entry)-1 + \ + ((int)sizeof(struct xfs_attr_sf_entry) + \ (sfep)->namelen+(sfep)->valuelen) #define XFS_ATTR_SF_NEXTENTRY(sfep) /* next entry in struct */ \ ((struct xfs_attr_sf_entry *)((char *)(sfep) + \ diff --git a/fs/xfs/libxfs/xfs_da_format.h b/fs/xfs/libxfs/xfs_da_format.h index e708b714bf99d..b40a4e80f5ee6 100644 --- a/fs/xfs/libxfs/xfs_da_format.h +++ b/fs/xfs/libxfs/xfs_da_format.h @@ -589,7 +589,7 @@ struct xfs_attr_shortform { uint8_t namelen; /* actual length of name (no NULL) */ uint8_t valuelen; /* actual length of value (no NULL) */ uint8_t flags; /* flags bits (see xfs_attr_leaf.h) */ - uint8_t nameval[1]; /* name & value bytes concatenated */ + uint8_t nameval[]; /* name & value bytes concatenated */ } list[1]; /* variable sized array */ };
nameval is a variable-size array, so, define it as it, and remove all the -1 magic number subtractions Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> --- Changelog: V2: - Drop wrong change to XFS_ATTR_SF_ENTSIZE_MAX fs/xfs/libxfs/xfs_attr_leaf.c | 6 ++---- fs/xfs/libxfs/xfs_attr_sf.h | 4 ++-- fs/xfs/libxfs/xfs_da_format.h | 2 +- 3 files changed, 5 insertions(+), 7 deletions(-)