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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-05-01 09:11:45 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-05-01 09:11:45 -0700 |
commit | f2125992e7cb25ece668cb7af2bd8433715827d1 (patch) | |
tree | b77642b52ae91c6bb0c6a932e0339361af9a5d86 /fs/xfs/xfs_file.c | |
parent | fff75eb2a08c2ac96404a2d79685668f3cf5a7a3 (diff) | |
parent | 7b38460dc8e4eafba06c78f8e37099d3b34d473c (diff) | |
download | linux-stable-f2125992e7cb25ece668cb7af2bd8433715827d1.tar.gz linux-stable-f2125992e7cb25ece668cb7af2bd8433715827d1.tar.bz2 linux-stable-f2125992e7cb25ece668cb7af2bd8433715827d1.zip |
Merge tag 'xfs-4.17-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs fixes from Darrick Wong:
"Here are a few more bug fixes for xfs for 4.17-rc4. Most of them are
fixes for bad behavior.
This series has been run through a full xfstests run during LSF and
through a quick xfstests run against this morning's master, with no
major failures reported.
Summary:
- Enhance inode fork verifiers to prevent loading of corrupted
metadata.
- Fix a crash when we try to convert extents format inodes to btree
format, we run out of space, but forget to revert the in-core state
changes.
- Fix file size checks when doing INSERT_RANGE that could cause files
to end up negative size if there previously was an extent mapped at
s_maxbytes.
- Fix a bug when doing a remove-then-add ATTR_REPLACE xattr update
where we forget to clear ATTR_REPLACE after the remove, which
causes the attr to be lost and the fs to shut down due to (what it
thinks is) inconsistent in-core state"
* tag 'xfs-4.17-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: don't fail when converting shortform attr to long form during ATTR_REPLACE
xfs: prevent creating negative-sized file via INSERT_RANGE
xfs: set format back to extents if xfs_bmap_extents_to_btree
xfs: enhance dinode verifier
Diffstat (limited to 'fs/xfs/xfs_file.c')
-rw-r--r-- | fs/xfs/xfs_file.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 299aee4b7b0b..eed073cc4778 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -778,22 +778,26 @@ xfs_file_fallocate( if (error) goto out_unlock; } else if (mode & FALLOC_FL_INSERT_RANGE) { - unsigned int blksize_mask = i_blocksize(inode) - 1; + unsigned int blksize_mask = i_blocksize(inode) - 1; + loff_t isize = i_size_read(inode); - new_size = i_size_read(inode) + len; if (offset & blksize_mask || len & blksize_mask) { error = -EINVAL; goto out_unlock; } - /* check the new inode size does not wrap through zero */ - if (new_size > inode->i_sb->s_maxbytes) { + /* + * New inode size must not exceed ->s_maxbytes, accounting for + * possible signed overflow. + */ + if (inode->i_sb->s_maxbytes - isize < len) { error = -EFBIG; goto out_unlock; } + new_size = isize + len; /* Offset should be less than i_size */ - if (offset >= i_size_read(inode)) { + if (offset >= isize) { error = -EINVAL; goto out_unlock; } |