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dlm: missing length check in check_config() 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Al Viro 2008-01-25 03:03:59 -05:00 committed by David Teigland
parent 4007685c6e
commit 02ed16b64d
1 changed files with 7 additions and 0 deletions
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7
fs/dlm/rcom.c
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@ -85,6 +85,7 @@ static void make_config(struct dlm_ls *ls, struct rcom_config *rf)
static int check_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) static int check_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
{ {
struct rcom_config *rf = (struct rcom_config *) rc->rc_buf; struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
size_t conf_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) { if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {
log_error(ls, "version mismatch: %x nodeid %d: %x", log_error(ls, "version mismatch: %x nodeid %d: %x",
@ -93,6 +94,12 @@ static int check_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
return -EPROTO; return -EPROTO;
} }
if (rc->rc_header.h_length < conf_size) {
log_error(ls, "config too short: %d nodeid %d",
rc->rc_header.h_length, nodeid);
return -EPROTO;
}
if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen || if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) { le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x", log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",