lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

dlm: dlm_process_incoming_buffer() fixes

Browse Source 
* check that length is large enough to cover the non-variable part of message or
  rcom resp. (after checking that it's large enough to cover the header, of
  course).

* kill more pointless casts

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 00:58:46 -05:00
committed by David Teigland
parent 8b0d8e03f8
commit eef7d739c2
4 changed files with 36 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
fs/dlm/midcomms.c
View File

@ -61,9 +61,9 @@ int dlm_process_incoming_buffer(int nodeid, const void *base,
union {
unsigned char __buf[DLM_INBUF_LEN];
/* this is to force proper alignment on some arches */
struct dlm_header dlm;
union dlm_packet p;
} __tmp;
struct dlm_header *msg = &__tmp.dlm;
union dlm_packet *p = &__tmp.p;
int ret = 0;
int err = 0;
uint16_t msglen;
@ -75,15 +75,22 @@ int dlm_process_incoming_buffer(int nodeid, const void *base,
message may wrap around the end of the buffer back to the
start, so we need to use a temp buffer and copy_from_cb. */
copy_from_cb(msg, base, offset, sizeof(struct dlm_header),
copy_from_cb(p, base, offset, sizeof(struct dlm_header),
limit);
msglen = le16_to_cpu(msg->h_length);
lockspace = msg->h_lockspace;
msglen = le16_to_cpu(p->header.h_length);
lockspace = p->header.h_lockspace;
err = -EINVAL;
if (msglen < sizeof(struct dlm_header))
break;
if (p->header.h_cmd == DLM_MSG) {
if (msglen < sizeof(struct dlm_message))
break;
} else {
if (msglen < sizeof(struct dlm_rcom))
break;
}
err = -E2BIG;
if (msglen > dlm_config.ci_buffer_size) {
log_print("message size %d from %d too big, buf len %d",
@ -104,26 +111,26 @@ int dlm_process_incoming_buffer(int nodeid, const void *base,
in the buffer on the stack (which should work for most
ordinary messages). */
if (msglen > DLM_INBUF_LEN && msg == &__tmp.dlm) {
msg = kmalloc(dlm_config.ci_buffer_size, GFP_KERNEL);
if (msg == NULL)
if (msglen > sizeof(__tmp) && p == &__tmp.p) {
p = kmalloc(dlm_config.ci_buffer_size, GFP_KERNEL);
if (p == NULL)
return ret;
}
copy_from_cb(msg, base, offset, msglen, limit);
copy_from_cb(p, base, offset, msglen, limit);
BUG_ON(lockspace != msg->h_lockspace);
BUG_ON(lockspace != p->header.h_lockspace);
ret += msglen;
offset += msglen;
offset &= (limit - 1);
len -= msglen;
dlm_receive_buffer(msg, nodeid);
dlm_receive_buffer(p, nodeid);
}
if (msg != &__tmp.dlm)
kfree(msg);
if (p != &__tmp.p)
kfree(p);
return err ? err : ret;
}