diff options
Diffstat (limited to 'net/9p/client.c')
| -rw-r--r-- | net/9p/client.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/net/9p/client.c b/net/9p/client.c index 33717b1b84d8..20088aa06343 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -469,20 +469,11 @@ p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, int err; pdu->offset = 0; - if (pdu->size == 0) - pdu->size = 7; err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); if (err) goto rewind_and_exit; - pdu->size = r_size; - pdu->id = r_type; - pdu->tag = r_tag; - - p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", - pdu->size, pdu->id, pdu->tag); - if (type) *type = r_type; if (tag) @@ -490,6 +481,16 @@ p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, if (size) *size = r_size; + if (pdu->size != r_size || r_size < 7) { + err = -EINVAL; + goto rewind_and_exit; + } + + pdu->id = r_type; + pdu->tag = r_tag; + + p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", + pdu->size, pdu->id, pdu->tag); rewind_and_exit: if (rewind) @@ -516,6 +517,12 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) int ecode; err = p9_parse_header(req->rc, NULL, &type, NULL, 0); + if (req->rc->size >= c->msize) { + p9_debug(P9_DEBUG_ERROR, + "requested packet size too big: %d\n", + req->rc->size); + return -EIO; + } /* * dump the response from server * This should be after check errors which poplulate pdu_fcall. |