kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Updates for 4.21:

Browse source 
- Fix a memory overflow bug for blocksize < pagesize
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEUzaAxoMeQq6m2jMV+H93GTRKtOsFAlwgKPoACgkQ+H93GTRK
 tOvXxBAAqAXKDYD04e+BkHJP5nrFos8U7jo/IWGninvf5dLVwQDjj4uhxZwG/4p9
 da6NN8l09FCe8q0EOl01j5lVJqK6WC1VcuZN2/J7Yq4B/+oCipdkJJ+mrM732Ix9
 cbOwFkdGheISMSvsOV6xIZv/khenVyQFNAHd9HnFAlGYcZOtU9kVnp7tapjTwdS/
 YAn+uBAfRWpXxLBy5W41hMOvbTM1gz4oTMRLTm00T3vdDd0UPrpGRaD0chs9KXHF
 9G3xYnUIBV/+DMJ/STYoWao0fOtM06ermYKq/7QqfY43me9RAaoCgbDU79dzz5AQ
 4TYn2oc3QBfNHnyZDq3agdBjXFN/I99/Rsgiqiu5gRTfyFkKZ5ts9IKVum+rhbEg
 qG+DLTYcfmNFWAI1KQ5uO/UpZo76GwzNUsz/vv6PheW+cORc/JGifHU2fif0XLDG
 xFgQqFSb8MWSWKnXZZgqvaNJIosvUg6mEZiQNrtu/p1tFZeaB/amPptdDvsDHqrT
 9roAhenLIbyBDLMqA84po1xYMMIJqTEbwvEQkWjtNh5LyVgRH1ZsVd63CTFWFdtQ
 czz38k3qiiAyv9MauV02aJx3CTrvFxeUFK3azGsJ9qI7f8UJ0dtIiH/SpEjRZyaI
 hh0f6KgMSF7lyyIx08ZpZ1QtJ0uhqvZ1o/REVNpEcYOJIEb2cAk=
 =MSPp
 -----END PGP SIGNATURE-----

Merge tag 'iomap-4.21-merge-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull iomap update from Darrick Wong:
 "Fix a memory overflow bug for blocksize < pagesize"

* tag 'iomap-4.21-merge-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  iomap: don't search past page end in iomap_is_partially_uptodate
This commit is contained in:
Linus Torvalds 2018-12-27 17:07:35 -08:00
commit bc77789a49
1 changed files with 15 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
fs/iomap.c
View file

@ -492,16 +492,29 @@ done:
}
EXPORT_SYMBOL_GPL(iomap_readpages);
/*
* iomap_is_partially_uptodate checks whether blocks within a page are
* uptodate or not.
*
* Returns true if all blocks which correspond to a file portion
* we want to read within the page are uptodate.
*/
int
iomap_is_partially_uptodate(struct page *page, unsigned long from,
unsigned long count)
{
struct iomap_page *iop = to_iomap_page(page);
struct inode *inode = page->mapping->host;
unsigned first = from >> inode->i_blkbits;
unsigned last = (from + count - 1) >> inode->i_blkbits;
unsigned len, first, last;
unsigned i;
/* Limit range to one page */
len = min_t(unsigned, PAGE_SIZE - from, count);
/* First and last blocks in range within page */
first = from >> inode->i_blkbits;
last = (from + len - 1) >> inode->i_blkbits;
if (iop) {
for (i = first; i <= last; i++)
if (!test_bit(i, iop->uptodate))