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| author | Goffredo Baroncelli <kreijack@inwind.it> | 2017-10-03 20:31:10 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-12 12:56:17 +0300 |
| commit | 3d2f69689821725774998aa471fa4f398d5a22ec (patch) | |
| tree | f0c56f3a3715c1cf3596d2ebb827b3c5168730c2 /fs/ceph/Kconfig | |
| parent | 301dfc653cac5ee2a96744e2fd4473576bec95d2 (diff) | |
| download | linux-3d2f69689821725774998aa471fa4f398d5a22ec.tar.xz | |
btrfs: avoid overflow when sector_t is 32 bit
commit 2d8ce70a08fe033c904115d59276ad86adeaa337 upstream.
Jean-Denis Girard noticed commit c821e7f3 "pass bytes to
btrfs_bio_alloc" (https://patchwork.kernel.org/patch/9763081/)
introduces a regression on 32 bit machines.
When CONFIG_LBDAF is _not_ defined (CONFIG_LBDAF == Support for large
(2TB+) block devices and files) sector_t is 32 bit on 32bit machines.
In the function submit_extent_page, 'sector' (which is sector_t type) is
multiplied by 512 to convert it from sectors to bytes, leading to an
overflow when the disk is bigger than 4GB (!).
I added a cast to u64 to avoid overflow.
Fixes: c821e7f3 ("btrfs: pass bytes to btrfs_bio_alloc")
Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
Tested-by: Jean-Denis Girard <jd.girard@sysnux.pf>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ceph/Kconfig')
0 files changed, 0 insertions, 0 deletions