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Tue, 28 Oct 2025 10:25:20 -0700 (PDT) Date: Tue, 28 Oct 2025 10:25:20 -0700 In-Reply-To: <68fc0765.a00a0220.9662e.000d.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6900fc80.050a0220.17b81f.0037.GAE@google.com> Subject: Forwarded: From: syzbot To: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject:=20 Author: jkoolstra@xs4all.nl #syz test --- fs/jfs/jfs_dtree.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c index 0ab83bb7bbdf..e919de01c42a 100644 --- a/fs/jfs/jfs_dtree.c +++ b/fs/jfs/jfs_dtree.c @@ -170,8 +170,8 @@ static void dtGetKey(dtpage_t * p, int i, struct compon= ent_name * key, static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp, int ri, struct component_name * key, int flag); =20 -static void dtInsertEntry(dtpage_t * p, int index, struct component_name *= key, - ddata_t * data, struct dt_lock **); +static int dtInsertEntry(dtpage_t * p, int index, struct component_name * = key, + ddata_t * data, struct dt_lock **); =20 static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp, struct dt_lock ** sdtlock, struct dt_lock ** ddtlock, @@ -891,7 +891,8 @@ int dtInsert(tid_t tid, struct inode *ip, lv->length =3D 1; dtlck->index++; =20 - dtInsertEntry(p, index, name, &data, &dtlck); + if (!(rc =3D dtInsertEntry(p, index, name, &data, &dtlck))) + return rc; =20 /* linelock stbl of non-root leaf page */ if (!(p->header.flag & BT_ROOT)) { @@ -3625,9 +3626,10 @@ static void dtGetKey(dtpage_t * p, int i, /* entry i= ndex */ * function: allocate free slot(s) and * write a leaf/internal entry * - * return: entry slot index + * * return: 0 - success; + * errno - failure; */ -static void dtInsertEntry(dtpage_t * p, int index, struct component_name *= key, +static int dtInsertEntry(dtpage_t * p, int index, struct component_name * = key, ddata_t * data, struct dt_lock ** dtlock) { struct dtslot *h, *t; @@ -3649,6 +3651,10 @@ static void dtInsertEntry(dtpage_t * p, int index, s= truct component_name * key, =20 /* allocate a free slot */ hsi =3D fsi =3D p->header.freelist; + if (fsi >=3D ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxs= lot)) { + jfs_err("Encountered corrupted dtpage before insert"); + return -EIO; + } h =3D &p->slot[fsi]; p->header.freelist =3D h->next; --p->header.freecnt; @@ -3697,6 +3703,10 @@ static void dtInsertEntry(dtpage_t * p, int index, s= truct component_name * key, while (klen) { /* get free slot */ fsi =3D p->header.freelist; + if (fsi >=3D ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.max= slot)) { + jfs_err("Encountered corrupted dtpage before insert"); + return -EIO; + } t =3D &p->slot[fsi]; p->header.freelist =3D t->next; --p->header.freecnt; @@ -3774,6 +3784,8 @@ static void dtInsertEntry(dtpage_t * p, int index, st= ruct component_name * key, =20 /* advance next available entry index of stbl */ ++p->header.nextindex; + + return 0; } =20 =20 --=20 2.51.1.dirty