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xfs: Use variable-size array for nameval in xfs_attr_sf_entry

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nameval is a variable-size array, so, define it as it, and remove all
the -1 magic number subtractions

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Carlos Maiolino 2020-09-04 09:51:39 -07:00 • committed by Darrick J. Wong
parent 47e6cc1000
commit c418dbc980
3 changed files with 6 additions and 7 deletions
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7
fs/xfs/libxfs/xfs_attr_leaf.c
View file

@ -992,9 +992,8 @@ 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
+ name_loc->namelen
+ be16_to_cpu(name_loc->valuelen);
bytes += XFS_ATTR_SF_ENTSIZE_BYNAME(name_loc->namelen,
be16_to_cpu(name_loc->valuelen));
}
if ((dp->i_mount->m_flags & XFS_MOUNT_ATTR2) &&
(dp->i_df.if_format != XFS_DINODE_FMT_BTREE) &&
@ -1039,7 +1038,7 @@ xfs_attr_shortform_verify(
* 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. */

4
fs/xfs/libxfs/xfs_attr_sf.h
View file

@ -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)))
((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) + \

2
fs/xfs/libxfs/xfs_da_format.h
View file

@ -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 */
};