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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 > --- > fs/jfs/jfs_dmap.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c > index 974ecf5e0d95..f65a07252c22 100644 > --- a/fs/jfs/jfs_dmap.c > +++ b/fs/jfs/jfs_dmap.c > @@ -1808,6 +1808,7 @@ dbAllocCtl(struct bmap * bmp, s64 nblocks, int l2nb, s64 blkno, s64 * results) > s64 b, lblkno, n; > struct metapage *mp; > struct dmap *dp; > + dmtree_t *tp; > > /* check if the allocation request is confined to a single dmap. > */ > @@ -1819,6 +1820,10 @@ dbAllocCtl(struct bmap * bmp, s64 nblocks, int l2nb, s64 blkno, s64 * results) > if (mp == NULL) > return -EIO; > dp = (struct dmap *) mp->data; > + tp = (dmtree_t *) &dp->tree; > + > + if (tp->dmt_budmin < 0) > + return -EIO; I'm simplifying this to: if (dp->tree.budmin < 0) return -EIO; > > /* try to allocate the blocks. > */ Other than that. It looks good. I'll apply it. Shaggy