[101/102] dm mpath: fix potential NULL pointer in feature arg processing

From: Greg KH
Date: Wed Aug 03 2011 - 19:35:23 EST


3.0-stable review patch. If anyone has any objections, please let us know.

------------------

From: Mike Snitzer <snitzer@xxxxxxxxxx>

commit 286f367dad40beb3234a18c17391d03ba939a7f3 upstream.

Avoid dereferencing a NULL pointer if the number of feature arguments
supplied is fewer than indicated.

Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
drivers/md/dm-mpath.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -807,6 +807,11 @@ static int parse_features(struct arg_set
if (!argc)
return 0;

+ if (argc > as->argc) {
+ ti->error = "not enough arguments for features";
+ return -EINVAL;
+ }
+
do {
param_name = shift(as);
argc--;


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