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fs: dlm: change allocation limits 

While running tcpkill I experienced invalid header length values while
receiving to check that a node doesn't try to send a invalid dlm message
we also check on applications minimum allocation limit. Also use
DEFAULT_BUFFER_SIZE as maximum allocation limit. The define
LOWCOMMS_MAX_TX_BUFFER_LEN is to calculate maximum buffer limits on
application layer, future midcomms layer will subtract their needs from
this define.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2021-03-01 17:05:14 -05:00 committed by David Teigland
parent 517461630d
commit c45674fbdd
1 changed files with 4 additions and 2 deletions
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6
fs/dlm/lowcomms.c
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@ -1376,9 +1376,11 @@ void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc)
struct writequeue_entry *e;
int offset = 0;
if (len > LOWCOMMS_MAX_TX_BUFFER_LEN) {
BUILD_BUG_ON(PAGE_SIZE < LOWCOMMS_MAX_TX_BUFFER_LEN);
if (len > DEFAULT_BUFFER_SIZE ||
len < sizeof(struct dlm_header)) {
BUILD_BUG_ON(PAGE_SIZE < DEFAULT_BUFFER_SIZE);
log_print("failed to allocate a buffer of size %d", len);
WARN_ON(1);
return NULL;
}