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| author | Ghanshyam Agrawal <ghanshyam1898@gmail.com> | 2024-09-30 13:42:18 +0530 |
|---|---|---|
| committer | Dave Kleikamp <dave.kleikamp@oracle.com> | 2024-10-29 16:53:18 -0500 |
| commit | a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d (patch) | |
| tree | ad22c691338220732087cc7943d9daaf207e8113 /fs/jfs | |
| parent | ca84a2c9be482836b86d780244f0357e5a778c46 (diff) | |
| download | lwn-a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d.tar.gz lwn-a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d.zip | |
jfs: fix shift-out-of-bounds in dbSplit
When dmt_budmin is less than zero, it causes errors
in the later stages. Added a check to return an error beforehand
in dbAllocCtl itself.
Reported-by: syzbot+b5ca8a249162c4b9a7d0@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b5ca8a249162c4b9a7d0
Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Diffstat (limited to 'fs/jfs')
| -rw-r--r-- | fs/jfs/jfs_dmap.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index 3ab410059dc2..39957361a7ee 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -1820,6 +1820,9 @@ dbAllocCtl(struct bmap * bmp, s64 nblocks, int l2nb, s64 blkno, s64 * results) return -EIO; dp = (struct dmap *) mp->data; + if (dp->tree.budmin < 0) + return -EIO; + /* try to allocate the blocks. */ rc = dbAllocDmapLev(bmp, dp, (int) nblocks, l2nb, results); |