diff options
| author | Colin Ian King <colin.king@canonical.com> | 2021-02-11 13:01:08 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-03 16:44:17 +0100 |
| commit | 81b5611d51882709cf24ffa5f7f59bf5c70a13a5 (patch) | |
| tree | 6c1c482216f60677ec5628e2fd80a9f83dca65d4 /fs | |
| parent | 506ea1d5a72d328665ad794a767fd39d734507ea (diff) | |
fs/jfs: fix potential integer overflow on shift of a int
[ Upstream commit 4208c398aae4c2290864ba15c3dab7111f32bec1 ]
The left shift of int 32 bit integer constant 1 is evaluated using 32 bit
arithmetic and then assigned to a signed 64 bit integer. In the case where
l2nb is 32 or more this can lead to an overflow. Avoid this by shifting
the value 1LL instead.
Addresses-Coverity: ("Uninitentional integer overflow")
Fixes: b40c2e665cd5 ("fs/jfs: TRIM support for JFS Filesystem")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/jfs/jfs_dmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index 2d514c7affc2..9ff510a489cb 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -1669,7 +1669,7 @@ s64 dbDiscardAG(struct inode *ip, int agno, s64 minlen) } else if (rc == -ENOSPC) { /* search for next smaller log2 block */ l2nb = BLKSTOL2(nblocks) - 1; - nblocks = 1 << l2nb; + nblocks = 1LL << l2nb; } else { /* Trim any already allocated blocks */ jfs_error(bmp->db_ipbmap->i_sb, "-EIO\n"); |