From: Sapan Bhatia <gwsapan@gmail.com>
Date: Fri, 23 Aug 2013 19:43:03 +0000 (-0400)
Subject: Extra checks
X-Git-Tag: procprotect-0.4-2~2
X-Git-Url: http://git.onelab.eu/?p=procprotect.git;a=commitdiff_plain;h=6b5f4d1c8ec902f63b1444fa107c2366ae5d435f

Extra checks
---

diff --git a/procprotect.c b/procprotect.c
index f8ab6e6..741a799 100644
--- a/procprotect.c
+++ b/procprotect.c
@@ -91,8 +91,14 @@ static int lookup_fast_entry(struct kretprobe_instance *ri, struct pt_regs *regs
     int ret = -1;
     struct procprotect_ctx *ctx;
     struct nameidata *nd = (struct nameidata *) regs->di;
-    struct dentry *parent = nd->path.dentry;
-    struct inode *pinode = parent->d_inode;
+    struct dentry *parent;
+    struct inode *pinode;
+	
+	if (!nd) return;
+	parent = nd->path.dentry;
+
+	if (!parent) return;
+	pinode = parent->d_inode;
 
     if (pinode->i_sb->s_magic == PROC_SUPER_MAGIC
             && current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {	
@@ -132,9 +138,13 @@ static int lookup_slow_entry(struct kretprobe_instance *ri, struct pt_regs *regs
     struct procprotect_ctx *ctx;
     struct nameidata *nd = (struct nameidata *) regs->di;
     struct path *p = (struct path *) regs->si;
+    struct dentry *parent;
+	struct inode *pinode;
 
-    struct dentry *parent = nd->path.dentry;
-    struct inode *pinode = parent->d_inode;
+	if (!nd) return;
+	parent = nd->path.dentry;
+    if (!parent) return;
+	pinode= parent->d_inode;
 
     if (pinode->i_sb->s_magic == PROC_SUPER_MAGIC
             && current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {