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| author |   David Howells <dhowells@redhat.com> | 2017-03-16 16:27:47 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2017-03-16 16:27:47 +0000 |
| commit | 146a1192783697810b63a1e41c4d59fc93387340 (patch) | |
| tree | f96b12c641b60681eeac2bfd612c8532793e6420 | |
| parent | afs: Use a bvec rather than a kvec in afs_send_pages() (diff) | |
| download | wireguard-linux-146a1192783697810b63a1e41c4d59fc93387340.tar.xz wireguard-linux-146a1192783697810b63a1e41c4d59fc93387340.zip | |
afs: Fix the maths in afs_fs_store_data()
afs_fs_store_data() works out of the size of the write it's going to make,
but it uses 32-bit unsigned subtraction in one place that gets
automatically cast to loff_t.
However, if to < offset, then the number goes negative, but as the result
isn't signed, this doesn't get sign-extended to 64-bits when placed in a
loff_t.
Fix by casting the operands to loff_t.
Signed-off-by: David Howells <dhowells@redhat.com>
| -rw-r--r-- | fs/afs/fsclient.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c index 0778c5b6b59b..d9234b767287 100644 --- a/fs/afs/fsclient.c +++ b/fs/afs/fsclient.c @@ -1236,7 +1236,7 @@ int afs_fs_store_data(struct afs_server *server, struct afs_writeback *wb, _enter(",%x,{%x:%u},,", key_serial(wb->key), vnode->fid.vid, vnode->fid.vnode); - size = to - offset; + size = (loff_t)to - (loff_t)offset; if (first != last) size += (loff_t)(last - first) << PAGE_SHIFT; pos = (loff_t)first << PAGE_SHIFT; |