mainline inclusion from mainline-v7.2-rc1 commit b5befa80fdbe287a98480effed9564712924add5 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/16564 CVE: CVE-2026-64266 Reference: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commi... -------------------------------- fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async end callback (eg fuse_writepage_free()) can free the args while the subsequent copy chain logic after fuse_ref_folio() accesses them, leading to use-after-free issues. Fix this by locking the request in fuse_ref_folio() before returning. Fixes: c3021629a0d8 ("fuse: support splice() reading from fuse device") Cc: stable@vger.kernel.org Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Conflicts: fs/fuse/dev.c [394244b24fdd ("fuse: support copying large folios") not merged.] Signed-off-by: Ran Hongyun <ranhongyun1@huawei.com> --- fs/fuse/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 1a12515fd8ea..2a7e48b3ba8a 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -1261,7 +1261,7 @@ static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page, cs->nr_segs++; cs->len = 0; - return 0; + return lock_request(cs->req); } /* -- 2.52.0