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l3DPaOQ5C4WBoO1iljjsMQSGdOwjOHMQ On 7/26/24 8:42PM, Edward Adam Davis wrote: > syzbot report a out of bounds in dbSplit, it because dmt_leafidx greater > than num leaves per dmap tree, add a checking for dmt_leafidx in dbFindLeaf. > > Reported-and-tested-by: syzbot+dca05492eff41f604890@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=dca05492eff41f604890 > Signed-off-by: Edward Adam Davis > --- > fs/jfs/jfs_dmap.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c > index cb3cda1390ad..516bac758053 100644 > --- a/fs/jfs/jfs_dmap.c > +++ b/fs/jfs/jfs_dmap.c > @@ -2976,6 +2976,8 @@ static int dbFindLeaf(dmtree_t *tp, int l2nb, int *leafidx, bool is_ctl) > */ > assert(n < 4); > } > + if (le32_to_cpu(tp->dmt_leafidx) >= LPERDMAP) > + return -ENOSPC; NACK. It needs to be smarter than this. dbFindLeaf() can be called with a control page in which dmt_leafidx is bound by LPERCTL, which is larger than LPERDMAP. > > /* set the return to the leftmost leaf describing sufficient > * free space.