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ext4: add bounds checking in get_max_inline_xattr_value_size() 

commit 2220eaf909 upstream.

Normally the extended attributes in the inode body would have been
checked when the inode is first opened, but if someone is writing to
the block device while the file system is mounted, it's possible for
the inode table to get corrupted.  Add bounds checking to avoid
reading beyond the end of allocated memory if this happens.

Reported-by: syzbot+1966db24521e5f6e23f7@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=1966db24521e5f6e23f7
Cc: stable@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Theodore Ts'o 2023-05-12 15:11:02 -04:00 committed by Greg Kroah-Hartman
parent 0b1c4357bb
commit e780058bd7
1 changed files with 11 additions and 1 deletions
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12
fs/ext4/inline.c
View File

@ -34,6 +34,7 @@ static int get_max_inline_xattr_value_size(struct inode *inode,
struct ext4_xattr_ibody_header *header;
struct ext4_xattr_entry *entry;
struct ext4_inode *raw_inode;
void *end;
int free, min_offs;
if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
@ -57,14 +58,23 @@ static int get_max_inline_xattr_value_size(struct inode *inode,
raw_inode = ext4_raw_inode(iloc);
header = IHDR(inode, raw_inode);
entry = IFIRST(header);
end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
/* Compute min_offs. */
for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
while (!IS_LAST_ENTRY(entry)) {
void *next = EXT4_XATTR_NEXT(entry);
if (next >= end) {
EXT4_ERROR_INODE(inode,
"corrupt xattr in inline inode");
return 0;
}
if (!entry->e_value_inum && entry->e_value_size) {
size_t offs = le16_to_cpu(entry->e_value_offs);
if (offs < min_offs)
min_offs = offs;
}
entry = next;
}
free = min_offs -
((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);