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SUNRPC: Make rpcb_decode_getaddr more picky about universal addresses 

Add better sanity checking of server replies to the GETVERSADDR reply
decoder.  Change the error return code: EIO is what other XDR decoding
routines return if there is a failure while decoding.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2007-09-11 18:00:31 -04:00 committed by Trond Myklebust
parent d66968f207
commit e65fe3976f
1 changed files with 22 additions and 4 deletions
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26
net/sunrpc/rpcb_clnt.c
View File

@ -528,12 +528,19 @@ static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
*portp = 0; *portp = 0;
addr_len = ntohl(*p++); addr_len = ntohl(*p++);
if (addr_len > RPCB_MAXADDRLEN) /* sanity */
return -EINVAL;
dprintk("RPC: rpcb_decode_getaddr returned string: '%s'\n", /*
(char *) p); * Simple sanity check. The smallest possible universal
* address is an IPv4 address string containing 11 bytes.
*/
if (addr_len < 11 || addr_len > RPCB_MAXADDRLEN)
goto out_err;
/*
* Start at the end and walk backwards until the first dot
* is encountered. When the second dot is found, we have
* both parts of the port number.
*/
addr = (char *)p; addr = (char *)p;
val = 0; val = 0;
first = 1; first = 1;
@ -555,8 +562,19 @@ static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
} }
} }
/*
* Simple sanity check. If we never saw a dot in the reply,
* then this was probably just garbage.
*/
if (first)
goto out_err;
dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp);
return 0; return 0;
out_err:
dprintk("RPC: rpcbind server returned malformed reply\n");
return -EIO;
} }
#define RPCB_program_sz (1u) #define RPCB_program_sz (1u)