CVE-2022-50770

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ocfs2: fix memory leak in ocfs2_mount_volume()<br /> <br /> There is a memory leak reported by kmemleak:<br /> <br /> unreferenced object 0xffff88810cc65e60 (size 32):<br /> comm "mount.ocfs2", pid 23753, jiffies 4302528942 (age 34735.105s)<br /> hex dump (first 32 bytes):<br /> 10 00 00 00 00 00 00 00 00 01 01 01 01 01 01 01 ................<br /> 01 01 01 01 01 01 01 01 00 00 00 00 00 00 00 00 ................<br /> backtrace:<br /> [] __kmalloc+0x4d/0x150<br /> [] ocfs2_compute_replay_slots+0x121/0x330 [ocfs2]<br /> [] ocfs2_check_volume+0x485/0x900 [ocfs2]<br /> [] ocfs2_mount_volume.isra.0+0x1e9/0x650 [ocfs2]<br /> [] ocfs2_fill_super+0xe0b/0x1740 [ocfs2]<br /> [] mount_bdev+0x312/0x400<br /> [] legacy_get_tree+0xed/0x1d0<br /> [] vfs_get_tree+0x7d/0x230<br /> [] path_mount+0xd62/0x1760<br /> [] do_mount+0xca/0xe0<br /> [] __x64_sys_mount+0x12c/0x1a0<br /> [] do_syscall_64+0x35/0x80<br /> [] entry_SYSCALL_64_after_hwframe+0x46/0xb0<br /> <br /> This call stack is related to two problems. Firstly, the ocfs2 super uses<br /> "replay_map" to trace online/offline slots, in order to recover offline<br /> slots during recovery and mount. But when ocfs2_truncate_log_init()<br /> returns an error in ocfs2_mount_volume(), the memory of "replay_map" will<br /> not be freed in error handling path. Secondly, the memory of "replay_map"<br /> will not be freed if d_make_root() returns an error in ocfs2_fill_super().<br /> But the memory of "replay_map" will be freed normally when completing<br /> recovery and mount in ocfs2_complete_mount_recovery().<br /> <br /> Fix the first problem by adding error handling path to free "replay_map"<br /> when ocfs2_truncate_log_init() fails. And fix the second problem by<br /> calling ocfs2_free_replay_slots(osb) in the error handling path<br /> "out_dismount". In addition, since ocfs2_free_replay_slots() is static,<br /> it is necessary to remove its static attribute and declare it in header<br /> file.