RDMA/cma: Do not change route.addr.src_addr outside state checks

If the state is not idle then resolve_prepare_src() should immediately
fail and no change to global state should happen. However, it
unconditionally overwrites the src_addr trying to build a temporary any
address.

For instance if the state is already RDMA_CM_LISTEN then this will corrupt
the src_addr and would cause the test in cma_cancel_operation():

           if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)

Which would manifest as this trace from syzkaller:

  BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 lib/list_debug.c:26
  Read of size 8 at addr ffff8881546491e0 by task syz-executor.1/32204

  CPU: 1 PID: 32204 Comm: syz-executor.1 Not tainted 5.12.0-rc8-syzkaller #0
  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
  Call Trace:
   __dump_stack lib/dump_stack.c:79 [inline]
   dump_stack+0x141/0x1d7 lib/dump_stack.c:120
   print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
   __kasan_report mm/kasan/report.c:399 [inline]
   kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
   __list_add_valid+0x93/0xa0 lib/list_debug.c:26
   __list_add include/linux/list.h:67 [inline]
   list_add_tail include/linux/list.h:100 [inline]
   cma_listen_on_all drivers/infiniband/core/cma.c:2557 [inline]
   rdma_listen+0x787/0xe00 drivers/infiniband/core/cma.c:3751
   ucma_listen+0x16a/0x210 drivers/infiniband/core/ucma.c:1102
   ucma_write+0x259/0x350 drivers/infiniband/core/ucma.c:1732
   vfs_write+0x28e/0xa30 fs/read_write.c:603
   ksys_write+0x1ee/0x250 fs/read_write.c:658
   do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
   entry_SYSCALL_64_after_hwframe+0x44/0xae

This is indicating that an rdma_id_private was destroyed without doing
cma_cancel_listens().

Instead of trying to re-use the src_addr memory to indirectly create an
any address derived from the dst build one explicitly on the stack and
bind to that as any other normal flow would do. rdma_bind_addr() will copy
it over the src_addr once it knows the state is valid.

This is similar to commit bc0bdc5afaa7 ("RDMA/cma: Do not change
route.addr.src_addr.ss_family")

Link: https://lore.kernel.org/r/0-v2-e975c8fd9ef2+11e-syz_cma_srcaddr_jgg@nvidia.com
Cc: stable@vger.kernel.org
Fixes: 732d41c545bb ("RDMA/cma: Make the locking for automatic state transition more clear")
Reported-by: syzbot+c94a3675a626f6333d74@syzkaller.appspotmail.com
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index c447526288f49e6614380d2635650d16c8621ece..50c53409ceb61bf6e992a979e0c262b322628ac1 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -3370,22 +3370,30 @@ err:
 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
                         const struct sockaddr *dst_addr)
 {
-       if (!src_addr || !src_addr->sa_family) {
-               src_addr = (struct sockaddr *) &id->route.addr.src_addr;
-               src_addr->sa_family = dst_addr->sa_family;
-               if (IS_ENABLED(CONFIG_IPV6) &&
-                   dst_addr->sa_family == AF_INET6) {
-                       struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
-                       struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
-                       src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
-                       if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
-                               id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
-               } else if (dst_addr->sa_family == AF_IB) {
-                       ((struct sockaddr_ib *) src_addr)->sib_pkey =
-                               ((struct sockaddr_ib *) dst_addr)->sib_pkey;
-               }
-       }
-       return rdma_bind_addr(id, src_addr);
+       struct sockaddr_storage zero_sock = {};
+
+       if (src_addr && src_addr->sa_family)
+               return rdma_bind_addr(id, src_addr);
+
+       /*
+        * When the src_addr is not specified, automatically supply an any addr
+        */
+       zero_sock.ss_family = dst_addr->sa_family;
+       if (IS_ENABLED(CONFIG_IPV6) && dst_addr->sa_family == AF_INET6) {
+               struct sockaddr_in6 *src_addr6 =
+                       (struct sockaddr_in6 *)&zero_sock;
+               struct sockaddr_in6 *dst_addr6 =
+                       (struct sockaddr_in6 *)dst_addr;
+
+               src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
+               if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+                       id->route.addr.dev_addr.bound_dev_if =
+                               dst_addr6->sin6_scope_id;
+       } else if (dst_addr->sa_family == AF_IB) {
+               ((struct sockaddr_ib *)&zero_sock)->sib_pkey =
+                       ((struct sockaddr_ib *)dst_addr)->sib_pkey;
+       }
+       return rdma_bind_addr(id, (struct sockaddr *)&zero_sock);
 }
 
 /*