ext2: add additional check to ext2 loader

Check if a pointer is NULL due to specifying an invalid inode group
number.

Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

diff --git a/core/fs/ext2/ext2.c b/core/fs/ext2/ext2.c
index 716670c..7988faa 100644 (file)
--- a/core/fs/ext2/ext2.c
+++ b/core/fs/ext2/ext2.c
@@ -164,6 +164,9 @@ static struct inode *ext2_iget_by_inr(struct fs_info *fs, uint32_t inr)
     struct inode *inode;
 
     e_inode = ext2_get_inode(fs, inr);
+    if (!e_inode)
+       return NULL;
+
     if (!(inode = alloc_inode(fs, inr, sizeof(struct ext2_pvt_inode))))
        return NULL;
     fill_inode(inode, e_inode);