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ufs: ufs_sb_private_info: remove unused s_{2,3}apb fields

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These two fields are populated and stored as a "frequently used value"
in ufs_fill_super, but are not used afterwards in the driver.

Moreover, one of the shifts triggers UBSAN: shift-out-of-bounds when
apbshift is 12 because 12 * 3 = 36 and 1 << 36 does not fit in the 32
bit integer used to store the value.

Closes: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2087853
Signed-off-by: Agathe Porte <agathe.porte@canonical.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Agathe Porte 2024-11-12 13:18:25 +01:00 committed by Al Viro
parent b57c010e70
commit 6cfe56fbad
2 changed files with 0 additions and 8 deletions
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4
fs/ufs/super.c
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@ -1229,11 +1229,7 @@ magic_found:
else else
uspi->s_apbshift = uspi->s_bshift - 2; uspi->s_apbshift = uspi->s_bshift - 2;
uspi->s_2apbshift = uspi->s_apbshift * 2;
uspi->s_3apbshift = uspi->s_apbshift * 3;
uspi->s_apb = 1 << uspi->s_apbshift; uspi->s_apb = 1 << uspi->s_apbshift;
uspi->s_2apb = 1 << uspi->s_2apbshift;
uspi->s_3apb = 1 << uspi->s_3apbshift;
uspi->s_apbmask = uspi->s_apb - 1; uspi->s_apbmask = uspi->s_apb - 1;
uspi->s_nspfshift = uspi->s_fshift - UFS_SECTOR_BITS; uspi->s_nspfshift = uspi->s_fshift - UFS_SECTOR_BITS;
uspi->s_nspb = uspi->s_nspf << uspi->s_fpbshift; uspi->s_nspb = uspi->s_nspf << uspi->s_fpbshift;

4
fs/ufs/ufs_fs.h
View File

@ -775,12 +775,8 @@ struct ufs_sb_private_info {
__u32 s_fpbmask; /* fragments per block mask */ __u32 s_fpbmask; /* fragments per block mask */
__u32 s_apb; /* address per block */ __u32 s_apb; /* address per block */
__u32 s_2apb; /* address per block^2 */
__u32 s_3apb; /* address per block^3 */
__u32 s_apbmask; /* address per block mask */ __u32 s_apbmask; /* address per block mask */
__u32 s_apbshift; /* address per block shift */ __u32 s_apbshift; /* address per block shift */
__u32 s_2apbshift; /* address per block shift * 2 */
__u32 s_3apbshift; /* address per block shift * 3 */
__u32 s_nspfshift; /* number of sector per fragment shift */ __u32 s_nspfshift; /* number of sector per fragment shift */
__u32 s_nspb; /* number of sector per block */ __u32 s_nspb; /* number of sector per block */
__u32 s_inopf; /* inodes per fragment */ __u32 s_inopf; /* inodes per fragment */