Messages in this thread Patch in this message | | | From | Manas Ghandat <> | Subject | [PATCH] jfs : fix array-index-out-of-bounds in diWrite | Date | Sun, 8 Oct 2023 23:17:45 +0530 |
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Currently while copying dtree root from inode to dnode in the xp slot there is a out of bound memcpy. Added a bound check to the memcpy.
Reported-by: syzbot+c1056fdfe414463fdb33@syzkaller.appspotmail.com Fixes: https://syzkaller.appspot.com/bug?extid=c1056fdfe414463fdb33 Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com> --- fs/jfs/jfs_imap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c index 799d3837e7c2..d1f897848be0 100644 --- a/fs/jfs/jfs_imap.c +++ b/fs/jfs/jfs_imap.c @@ -746,7 +746,8 @@ int diWrite(tid_t tid, struct inode *ip) xp = (dtpage_t *) & dp->di_dtroot; lv = ilinelock->lv; for (n = 0; n < ilinelock->index; n++, lv++) { - memcpy(&xp->slot[lv->offset], &p->slot[lv->offset], + if (lv->offset < 128) + memcpy(&xp->slot[lv->offset], &p->slot[lv->offset], lv->length << L2DTSLOTSIZE); } } else { -- 2.37.2
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