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fuse: lock inode unconditionally in fuse_fallocate()

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commit 44361e8cf9ddb23f17bdcc40ca944abf32e83e79 upstream.

file_modified() must be called with inode lock held.  fuse_fallocate()
didn't lock the inode in case of just FALLOC_KEEP_SIZE flags value, which
resulted in a kernel Warning in notify_change().

Lock the inode unconditionally, like all other fallocate implementations
do.

Reported-by: Pengfei Xu <pengfei.xu@intel.com>
Reported-and-tested-by: syzbot+462da39f0667b357c4b6@syzkaller.appspotmail.com
Fixes: 4a6f278d4827 ("fuse: add file_modified() to fallocate")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi
2022-11-23 09:10:42 +01:00
committed by Greg Kroah-Hartman
parent 3659e33c1e
commit 9fd11e2de7
1 changed files with 7 additions and 13 deletions
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20
fs/fuse/file.c
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@@ -3212,24 +3212,19 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
.mode = mode
};
int err;
bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) ||
(mode & FALLOC_FL_PUNCH_HOLE);
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;
if (fc->no_fallocate)
return -EOPNOTSUPP;
if (lock_inode) {
inode_lock(inode);
if (mode & FALLOC_FL_PUNCH_HOLE) {
loff_t endbyte = offset + length - 1;
inode_lock(inode);
if (mode & FALLOC_FL_PUNCH_HOLE) {
loff_t endbyte = offset + length - 1;
err = fuse_writeback_range(inode, offset, endbyte);
if (err)
goto out;
}
err = fuse_writeback_range(inode, offset, endbyte);
if (err)
goto out;
}
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
@@ -3276,8 +3271,7 @@ out:
if (!(mode & FALLOC_FL_KEEP_SIZE))
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
if (lock_inode)
inode_unlock(inode);
inode_unlock(inode);
return err;
}