[Cluster-devel] [PATCH dlm/next 3/6] fs: dlm: disallow buffer size below default
Alexander Aring
aahringo at redhat.com
Fri Sep 18 14:27:25 UTC 2020
I observed dlm messages cannot below this value delivered from upper
layers. This buffer is used inside the current receive handling to copy a
dlm message into it. However we should not allow sizes below the default
value.
Signed-off-by: Alexander Aring <aahringo at redhat.com>
---
fs/dlm/config.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 2b30104a34cef..1734f2e861924 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -166,8 +166,14 @@ static bool dlm_check_zero(unsigned int x)
return !x;
}
+#define DEFAULT_BUFFER_SIZE 4096
+static bool dlm_check_buffer_size(unsigned int x)
+{
+ return (x < DEFAULT_BUFFER_SIZE);
+}
+
CLUSTER_ATTR(tcp_port, dlm_check_zero);
-CLUSTER_ATTR(buffer_size, dlm_check_zero);
+CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
CLUSTER_ATTR(recover_timer, dlm_check_zero);
CLUSTER_ATTR(toss_secs, dlm_check_zero);
@@ -897,7 +903,6 @@ int dlm_our_addr(struct sockaddr_storage *addr, int num)
/* Config file defaults */
#define DEFAULT_TCP_PORT 21064
-#define DEFAULT_BUFFER_SIZE 4096
#define DEFAULT_RSBTBL_SIZE 1024
#define DEFAULT_RECOVER_TIMER 5
#define DEFAULT_TOSS_SECS 10
--
2.26.2
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