From: Eric Anderle <eanderle@xxxxxxxxx>
We should catch errors in the format at the time the list is given to
the kernel, rather than just returning garbage to the client and letting
the client fail.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxxxxxx>
---
fs/nfsd/nfs4pnfsdlm.c | 29 +++++++++++++++++++++++------
1 files changed, 23 insertions(+), 6 deletions(-)
diff --git a/fs/nfsd/nfs4pnfsdlm.c b/fs/nfsd/nfs4pnfsdlm.c
index 1cf1b69..b6d9f23 100644
--- a/fs/nfsd/nfs4pnfsdlm.c
+++ b/fs/nfsd/nfs4pnfsdlm.c
@@ -26,6 +26,7 @@
#include <linux/nfsd/debug.h>
#include <linux/nfsd/nfs4pnfsdlm.h>
#include <linux/nfsd/nfs4layoutxdr.h>
+#include <linux/sunrpc/clnt.h>
#include "nfsfh.h"
#include "nfsd.h"
@@ -87,6 +88,24 @@ out:
return ret;
}
+bool nfsd4_validate_pnfs_dlm_device(char *ds_list, int len, int *num_ds)
+{
+ char *start = ds_list;
+
+ *num_ds = 0;
+
+ while (*start) {
+ struct sockaddr_storage tempAddr;
+ int ipLen = strcspn(start, ",");
+
+ if (!rpc_pton(start, ipLen, (struct sockaddr *)&tempAddr, sizeof(tempAddr)))
+ return false;
+ (*num_ds)++;
+ start += ipLen + 1;
+ }
+ return true;
+}
+
/*
* pnfs_dlm_device string format:
* block-device-path:<ds1 ipv4 address>,<ds2 ipv4 address>
@@ -140,12 +159,10 @@ nfsd4_set_pnfs_dlm_device(char *pnfs_dlm_device, int len)
goto out_free;
memcpy(new->ds_list, bufp, len);
- /* count the number of comma-delimited DS IPs */
- new->num_ds = 1;
- while ((bufp = strchr(bufp, ',')) != NULL) {
- new->num_ds++;
- bufp++;
- }
+
+ /* validate the ips */
+ if (!nfsd4_validate_pnfs_dlm_device(new->ds_list, len, &(new->num_ds)))
+ goto out_free;
dprintk("%s disk_name %s num_ds %d ds_list %s\n", __func__,
new->disk_name, new->num_ds, new->ds_list);
--
1.7.0.4
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