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fsck.f2fs: fix to check validation of i_xattr_nid

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Otherwise, fsck.f2fs will access invalid memory address as below:

- fsck_verify
 - dump_node
  - dump_file
   - dump_inode_blk
    - dump_xattr
     - read_all_xattrs
       - get_node_info
        access &(F2FS_FSCK(sbi)->entries[nid])

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-04-07 18:01:07 +08:00 committed by Jaegeuk Kim
parent f73f222723
commit 7a22451bc2
5 changed files with 36 additions and 5 deletions
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2
fsck/dump.c
View File

@ -309,6 +309,8 @@ static void dump_xattr(struct f2fs_sb_info *sbi, struct f2fs_node *node_blk)
int ret;
xattr = read_all_xattrs(sbi, node_blk);
if (!xattr)
return;
list_for_each_xattr(ent, xattr) {
char *name = strndup(ent->e_name, ent->e_name_len);

8
fsck/fsck.c
View File

@ -487,6 +487,14 @@ static int sanity_check_nid(struct f2fs_sb_info *sbi, u32 nid,
return 0;
}
int fsck_sanity_check_nid(struct f2fs_sb_info *sbi, u32 nid,
struct f2fs_node *node_blk,
enum FILE_TYPE ftype, enum NODE_TYPE ntype,
struct node_info *ni)
{
return sanity_check_nid(sbi, nid, node_blk, ftype, ntype, ni);
}
static int fsck_chk_xattr_blk(struct f2fs_sb_info *sbi, u32 ino,
u32 x_nid, u32 *blk_cnt)
{

3
fsck/fsck.h
View File

@ -144,6 +144,9 @@ static inline bool need_fsync_data_record(struct f2fs_sb_info *sbi)
extern int fsck_chk_orphan_node(struct f2fs_sb_info *);
extern int fsck_chk_quota_node(struct f2fs_sb_info *);
extern int fsck_chk_quota_files(struct f2fs_sb_info *);
extern int fsck_sanity_check_nid(struct f2fs_sb_info *, u32,
struct f2fs_node *, enum FILE_TYPE, enum NODE_TYPE,
struct node_info *);
extern int fsck_chk_node_blk(struct f2fs_sb_info *, struct f2fs_inode *, u32,
enum FILE_TYPE, enum NODE_TYPE, u32 *,
struct child_info *);

8
fsck/mount.c
View File

@ -257,10 +257,12 @@ void print_inode_info(struct f2fs_sb_info *sbi,
DISP_u32(inode, i_nid[4]); /* double indirect */
xattr_addr = read_all_xattrs(sbi, node);
list_for_each_xattr(ent, xattr_addr) {
print_xattr_entry(ent);
if (xattr_addr) {
list_for_each_xattr(ent, xattr_addr) {
print_xattr_entry(ent);
}
free(xattr_addr);
}
free(xattr_addr);
printf("\n");
}

20
fsck/xattr.c
View File

@ -22,6 +22,22 @@ void *read_all_xattrs(struct f2fs_sb_info *sbi, struct f2fs_node *inode)
struct f2fs_xattr_header *header;
void *txattr_addr;
u64 inline_size = inline_xattr_size(&inode->i);
nid_t xnid = le32_to_cpu(inode->i.i_xattr_nid);
if (xnid) {
struct f2fs_node *node_blk = NULL;
struct node_info ni;
int ret;
node_blk = (struct f2fs_node *)calloc(BLOCK_SZ, 1);
ASSERT(node_blk != NULL);
ret = fsck_sanity_check_nid(sbi, xnid, node_blk,
F2FS_FT_XATTR, TYPE_XATTR, &ni);
free(node_blk);
if (ret)
return NULL;
}
txattr_addr = calloc(inline_size + BLOCK_SZ, 1);
ASSERT(txattr_addr);
@ -30,11 +46,11 @@ void *read_all_xattrs(struct f2fs_sb_info *sbi, struct f2fs_node *inode)
memcpy(txattr_addr, inline_xattr_addr(&inode->i), inline_size);
/* Read from xattr node block. */
if (inode->i.i_xattr_nid) {
if (xnid) {
struct node_info ni;
int ret;
get_node_info(sbi, le32_to_cpu(inode->i.i_xattr_nid), &ni);
get_node_info(sbi, xnid, &ni);
ret = dev_read_block(txattr_addr + inline_size, ni.blk_addr);
ASSERT(ret >= 0);
}