[PATCH 6.6 083/299] fs/ntfs3: Disable ATTR_LIST_ENTRY size check

Greg Kroah-Hartman
2024-02-27T13:50:26Z

From: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

[ Upstream commit 4cdfb6e7bc9c80142d33bf1d4653a73fa678ba56 ]

The use of sizeof(struct ATTR_LIST_ENTRY) has been replaced with le_size(0)
due to alignment peculiarities on different platforms.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312071005.g6YrbaIe-lkp@intel.com/
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ntfs3/attrlist.c | 8 ++++----
fs/ntfs3/ntfs.h | 2 --
2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/ntfs3/attrlist.c b/fs/ntfs3/attrlist.c
index 7c01735d1219d..48e7da47c6b71 100644
--- a/fs/ntfs3/attrlist.c
+++ b/fs/ntfs3/attrlist.c
@@ -127,12 +127,13 @@ struct ATTR_LIST_ENTRY *al_enumerate(struct ntfs_inode *ni,
{
size_t off;
u16 sz;
+ const unsigned le_min_size = le_size(0);

if (!le) {
le = ni->attr_list.le;
} else {
sz = le16_to_cpu(le->size);
- if (sz < sizeof(struct ATTR_LIST_ENTRY)) {
+ if (sz < le_min_size) {
/* Impossible 'cause we should not return such le. */
return NULL;
}
@@ -141,7 +142,7 @@ struct ATTR_LIST_ENTRY *al_enumerate(struct ntfs_inode *ni,

/* Check boundary. */
off = PtrOffset(ni->attr_list.le, le);
- if (off + sizeof(struct ATTR_LIST_ENTRY) > ni->attr_list.size) {
+ if (off + le_min_size > ni->attr_list.size) {
/* The regular end of list. */
return NULL;
}
@@ -149,8 +150,7 @@ struct ATTR_LIST_ENTRY *al_enumerate(struct ntfs_inode *ni,
sz = le16_to_cpu(le->size);

/* Check le for errors. */
- if (sz < sizeof(struct ATTR_LIST_ENTRY) ||
- off + sz > ni->attr_list.size ||
+ if (sz < le_min_size || off + sz > ni->attr_list.size ||
sz < le->name_off + le->name_len * sizeof(short)) {
return NULL;
}
diff --git a/fs/ntfs3/ntfs.h b/fs/ntfs3/ntfs.h
index 13e96fc63dae5..f61f5b3adb03a 100644
--- a/fs/ntfs3/ntfs.h
+++ b/fs/ntfs3/ntfs.h
@@ -527,8 +527,6 @@ struct ATTR_LIST_ENTRY {

}; // sizeof(0x20)

-static_assert(sizeof(struct ATTR_LIST_ENTRY) == 0x20);
-
static inline u32 le_size(u8 name_len)
{
return ALIGN(offsetof(struct ATTR_LIST_ENTRY, name) +
--
2.43.0