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| author | Colin Ian King <colin.king@canonical.com> | 2020-08-12 04:35:53 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-21 10:48:22 +0300 |
| commit | 50d3cd6fedfc40345b018cc0552bb62a47e1a155 (patch) | |
| tree | 1db811c0be4bd06673029578fda4e8eac2470e44 | |
| parent | e4ddf4e58946c7dfe8568a21ee3d27b03d96bc56 (diff) | |
| download | linux-50d3cd6fedfc40345b018cc0552bb62a47e1a155.tar.xz | |
fs/ufs: avoid potential u32 multiplication overflow
[ Upstream commit 88b2e9b06381551b707d980627ad0591191f7a2d ]
The 64 bit ino is being compared to the product of two u32 values,
however, the multiplication is being performed using a 32 bit multiply so
there is a potential of an overflow. To be fully safe, cast uspi->s_ncg
to a u64 to ensure a 64 bit multiplication occurs to avoid any chance of
overflow.
Fixes: f3e2a520f5fb ("ufs: NFS support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Evgeniy Dushistov <dushistov@mail.ru>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Link: http://lkml.kernel.org/r/20200715170355.1081713-1-colin.king@canonical.com
Addresses-Coverity: ("Unintentional integer overflow")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/ufs/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 6440003f8ddc..e3f3a0df6027 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -99,7 +99,7 @@ static struct inode *ufs_nfs_get_inode(struct super_block *sb, u64 ino, u32 gene struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; struct inode *inode; - if (ino < UFS_ROOTINO || ino > uspi->s_ncg * uspi->s_ipg) + if (ino < UFS_ROOTINO || ino > (u64)uspi->s_ncg * uspi->s_ipg) return ERR_PTR(-ESTALE); inode = ufs_iget(sb, ino); |