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[124.244.14.158]) by smtp.gmail.com with ESMTPSA id q14-20020a17090311ce00b001754fa42065sm1356022plh.143.2022.10.25.08.21.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Oct 2022 08:21:41 -0700 (PDT) From: Hoi Pok Wu To: shaggy@kernel.org Cc: Hoi Pok Wu , jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzbot+f0e0fcf3cd1047ae60ad@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com Subject: [PATCH V2] fs: jfs: fix shift-out-of-bounds in dbDiscardAG Date: Tue, 25 Oct 2022 23:20:45 +0800 Message-Id: <20221025152045.343650-1-wuhoipok@gmail.com> X-Mailer: git-send-email 2.38.1 MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747121789455293227?= X-GMAIL-MSGID: =?utf-8?q?1747673811765057380?= This should be applied to most URSAN bugs found recently by syzbot, by guarding the dbMount. As syzbot feeding rubbish into the bmap descriptor. Signed-off-by: Hoi Pok Wu --- V1->2: guarding the corrupted data structure from dbMount instead 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 e1cbfbb60303..765838578a72 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -198,6 +198,11 @@ int dbMount(struct inode *ipbmap) goto err_release_metapage; } + if (((bmp->db_mapsize - 1) >> bmp->db_agl2size) > MAXAG) { + err = -EINVAL; + goto err_release_metapage; + } + for (i = 0; i < MAXAG; i++) bmp->db_agfree[i] = le64_to_cpu(dbmp_le->dn_agfree[i]); bmp->db_agsize = le64_to_cpu(dbmp_le->dn_agsize);