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inet6: fix a LOR between rip and rawinp

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Running sys/netpfil/pf/fragmentation v6 results in:

lock order reversal:
 1st 0xfffffe00050429a8 rip (rip, sleep mutex) @ /usr/src/sys/netinet6/raw_ip6.c:803
 2nd 0xfffff8009491e1d0 rawinp (rawinp, rw) @ /usr/src/sys/netinet6/raw_ip6.c:804
lock order rawinp -> rip established at:
0xffffffff8068e26a at witness_lock_order_add+0x28a
0xffffffff8068d087 at witness_checkorder+0x627
0xffffffff805a9f05 at __mtx_lock_flags+0x205
0xffffffff808102e4 at in_pcballoc+0x204
0xffffffff808d53c6 at rip6_attach+0x116
0xffffffff806dc4e8 at socreate+0x368
0xffffffff806eaedc at kern_socket+0xfc
0xffffffff806eadcd at sys_socket+0x2d
0xffffffff80abc774 at syscallenter+0x5c4
0xffffffff80abbeeb at amd64_syscall+0x1b
 0xffffffff80a8044b at fast_syscall_common+0xf8
lock order rip -> rawinp attempted at:
0xffffffff8068dc2a at witness_checkorder+0x11ca
0xffffffff805d1b7f at _rw_wlock_cookie+0x18f
0xffffffff808d596c at rip6_connect+0x19c
0xffffffff806e0842 at soconnectat+0x142
0xffffffff806ebe36 at kern_connectat+0x136
0xffffffff806ebcdf at sys_connect+0x4f
0xffffffff80abc774 at syscallenter+0x5c4
0xffffffff80abbeeb at amd64_syscall+0x1b
0xffffffff80a8044b at fast_syscall_common+0xf8

Reviewed by:	glebius
Fixes:	de2d47842e ("SMR protection for inpcbs")
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D33508
This commit is contained in:
Mateusz Guzik 2021-12-16 15:11:42 +01:00
parent 48014c6679
commit 71a1539e37
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
sys/netinet6/raw_ip6.c
View File

@ -800,24 +800,24 @@ rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
return (error);
INP_INFO_WLOCK(&V_ripcbinfo);
INP_WLOCK(inp);
INP_INFO_WLOCK(&V_ripcbinfo);
/* Source address selection. XXX: need pcblookup? */
NET_EPOCH_ENTER(et);
error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
inp, so->so_cred, scope_ambiguous, &in6a, NULL);
NET_EPOCH_EXIT(et);
if (error) {
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_ripcbinfo);
INP_WUNLOCK(inp);
return (error);
}
inp->in6p_faddr = addr->sin6_addr;
inp->in6p_laddr = in6a;
soisconnected(so);
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_ripcbinfo);
INP_WUNLOCK(inp);
return (0);
}