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authorAl Viro <viro@zeniv.linux.org.uk>2008-01-25 08:58:46 +0300
committerDavid Teigland <teigland@redhat.com>2008-02-04 10:22:42 +0300
commiteef7d739c218cb2546cf95686db77de0d76e4122 (patch)
tree4d6c0e65e8aff1afb2c6428c729a98274ccb1a6d /fs/dlm/midcomms.c
parent8b0d8e03f847d9c1677b8a193cd124debbc54633 (diff)
downloadlinux-eef7d739c218cb2546cf95686db77de0d76e4122.tar.xz
dlm: dlm_process_incoming_buffer() fixes
* 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>
Diffstat (limited to 'fs/dlm/midcomms.c')
-rw-r--r--fs/dlm/midcomms.c33
1 files changed, 20 insertions, 13 deletions
diff --git a/fs/dlm/midcomms.c b/fs/dlm/midcomms.c
index e69926e984db..07ac709f3ed7 100644
--- a/fs/dlm/midcomms.c
+++ b/fs/dlm/midcomms.c
@@ -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;
}