[PATCH] fix potential null pointer deref in quota

[Jesper Juhl]

The coverity checker noticed that we may pass a NULL super_block to
do_quotactl() that dereferences it.
Dereferencing NULL pointers is bad medicine, better check and fail 
gracefully.

Signed-off-by: Jesper Juhl <jesper.juhl@xxxxxxxxx>
---

 fs/quota.c |    3 +++
 1 files changed, 3 insertions(+)

--- linux-2.6.16-rc6-orig/fs/quota.c	2006-03-12 14:19:02.000000000 +0100
+++ linux-2.6.16-rc6/fs/quota.c	2006-03-18 23:03:32.000000000 +0100
@@ -231,6 +231,9 @@ static int do_quotactl(struct super_bloc
 {
 	int ret;
 
+	if (!sb)
+		return -ENODEV;
+
 	switch (cmd) {
 		case Q_QUOTAON: {
 			char *pathname;


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