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afs: Always build address lists using the helper functions 

Make the address list string parser use the helper functions for adding
addresses to an address list so that they end up appropriately sorted.
This will better handles overruns and make them easier to compare.

It also reduces the number of places that addresses are handled, making it
easier to fix the handling.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2018-10-04 09:32:27 +01:00
parent 68eb64c3d2
commit 4c19bbdc7f
1 changed files with 15 additions and 17 deletions
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32
fs/afs/addr_list.c
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@ -116,8 +116,10 @@ struct afs_addr_list *afs_parse_text_addrs(const char *text, size_t len,
/* Extract the addresses */
p = text;
do {
struct sockaddr_rxrpc *srx = &alist->addrs[alist->nr_addrs];
const char *q, *stop;
unsigned int xport = port;
__be32 x[4];
int family;
if (*p == delim) {
p++;
@ -133,19 +135,12 @@ struct afs_addr_list *afs_parse_text_addrs(const char *text, size_t len,
break;
}
if (in4_pton(p, q - p,
(u8 *)&srx->transport.sin6.sin6_addr.s6_addr32[3],
-1, &stop)) {
srx->transport.sin6.sin6_addr.s6_addr32[0] = 0;
srx->transport.sin6.sin6_addr.s6_addr32[1] = 0;
srx->transport.sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
} else if (in6_pton(p, q - p,
srx->transport.sin6.sin6_addr.s6_addr,
-1, &stop)) {
/* Nothing to do */
} else {
if (in4_pton(p, q - p, (u8 *)&x[0], -1, &stop))
family = AF_INET;
else if (in6_pton(p, q - p, (u8 *)x, -1, &stop))
family = AF_INET6;
else
goto bad_address;
}
if (stop != q)
goto bad_address;
@ -157,7 +152,7 @@ struct afs_addr_list *afs_parse_text_addrs(const char *text, size_t len,
if (p < end) {
if (*p == '+') {
/* Port number specification "+1234" */
unsigned int xport = 0;
xport = 0;
p++;
if (p >= end || !isdigit(*p))
goto bad_address;
@ -168,7 +163,6 @@ struct afs_addr_list *afs_parse_text_addrs(const char *text, size_t len,
goto bad_address;
p++;
} while (p < end && isdigit(*p));
srx->transport.sin6.sin6_port = htons(xport);
} else if (*p == delim) {
p++;
} else {
@ -176,8 +170,12 @@ struct afs_addr_list *afs_parse_text_addrs(const char *text, size_t len,
}
}
alist->nr_addrs++;
} while (p < end && alist->nr_addrs < alist->max_addrs);
if (family == AF_INET)
afs_merge_fs_addr4(alist, x[0], xport);
else
afs_merge_fs_addr6(alist, x, xport);
} while (p < end);
_leave(" = [nr %u]", alist->nr_addrs);
return alist;