diff options
| author | Thorsten Blum <thorsten.blum@toblux.com> | 2024-07-31 00:02:02 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2024-08-26 23:40:06 -0400 |
| commit | 01cdf03b1378f2d860d4eb5951895a92002226a3 (patch) | |
| tree | a06dbfc1bc770339720d990c54ef410eb3e66be9 /fs/ext4/xattr.c | |
| parent | 736c24e62e7e1f5d00fb5b750bb7c13c56410d07 (diff) | |
ext4: annotate struct ext4_xattr_inode_array with __counted_by()
Add the __counted_by compiler attribute to the flexible array member
inodes to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.
Remove the now obsolete comment on the count field.
In ext4_expand_inode_array(), use struct_size() instead of offsetof()
and remove the local variable count. Increment the count field before
adding a new inode to the inodes array.
Compile-tested only.
Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Link: https://patch.msgid.link/20240730220200.410939-3-thorsten.blum@toblux.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/xattr.c')
| -rw-r--r-- | fs/ext4/xattr.c | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 31c5189e131f..c14a674c3e3d 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2879,33 +2879,31 @@ ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, if (*ea_inode_array == NULL) { /* * Start with 15 inodes, so it fits into a power-of-two size. - * If *ea_inode_array is NULL, this is essentially offsetof() */ - (*ea_inode_array) = - kmalloc(offsetof(struct ext4_xattr_inode_array, - inodes[EIA_MASK]), - GFP_NOFS); + (*ea_inode_array) = kmalloc( + struct_size(*ea_inode_array, inodes, EIA_MASK), + GFP_NOFS); if (*ea_inode_array == NULL) return -ENOMEM; (*ea_inode_array)->count = 0; } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { /* expand the array once all 15 + n * 16 slots are full */ struct ext4_xattr_inode_array *new_array = NULL; - int count = (*ea_inode_array)->count; - /* if new_array is NULL, this is essentially offsetof() */ new_array = kmalloc( - offsetof(struct ext4_xattr_inode_array, - inodes[count + EIA_INCR]), - GFP_NOFS); + struct_size(*ea_inode_array, inodes, + (*ea_inode_array)->count + EIA_INCR), + GFP_NOFS); if (new_array == NULL) return -ENOMEM; memcpy(new_array, *ea_inode_array, - offsetof(struct ext4_xattr_inode_array, inodes[count])); + struct_size(*ea_inode_array, inodes, + (*ea_inode_array)->count)); kfree(*ea_inode_array); *ea_inode_array = new_array; } - (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; + (*ea_inode_array)->count++; + (*ea_inode_array)->inodes[(*ea_inode_array)->count - 1] = inode; return 0; } |