CVE-2021-47238

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: fix memory leak in ip_mc_add1_src BUG: memory leak unreferenced object 0xffff888101bc4c00 (size 32): comm "syz-executor527", pid 360, jiffies 4294807421 (age 19.329s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................ backtrace: [] kmalloc include/linux/slab.h:558 [inline] [] kzalloc include/linux/slab.h:688 [inline] [] ip_mc_add1_src net/ipv4/igmp.c:1971 [inline] [] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095 [] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416 [] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [inline] [] ip_setsockopt+0x114b/0x30c0 net/ipv4/ip_sockglue.c:1423 [] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857 [] __sys_setsockopt+0x158/0x270 net/socket.c:2117 [] __do_sys_setsockopt net/socket.c:2128 [inline] [] __se_sys_setsockopt net/socket.c:2125 [inline] [] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125 [] do_syscall_64+0x40/0x80 arch/x86/entry/common.c:47 [] entry_SYSCALL_64_after_hwframe+0x44/0xae In commit 24803f38a5c0 ("igmp: do not remove igmp souce list info when set link down"), the ip_mc_clear_src() in ip_mc_destroy_dev() was removed, because it was also called in igmpv3_clear_delrec(). Rough callgraph: inetdev_destroy -> ip_mc_destroy_dev -> igmpv3_clear_delrec -> ip_mc_clear_src -> RCU_INIT_POINTER(dev->ip_ptr, NULL) However, ip_mc_clear_src() called in igmpv3_clear_delrec() doesn't release in_dev->mc_list->sources. And RCU_INIT_POINTER() assigns the NULL to dev->ip_ptr. As a result, in_dev cannot be obtained through inetdev_by_index() and then in_dev->mc_list->sources cannot be released by ip_mc_del1_src() in the sock_close. Rough call sequence goes like: sock_close -> __sock_release -> inet_release -> ip_mc_drop_socket -> inetdev_by_index -> ip_mc_leave_src -> ip_mc_del_src -> ip_mc_del1_src So we still need to call ip_mc_clear_src() in ip_mc_destroy_dev() to free in_dev->mc_list->sources.

This Cyber News was published on www.tenable.com. Publication date: Wed, 22 May 2024 10:56:03 +0000

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