[syslinux] [PATCH] add additional checks to ext2 loader

[Frediano Ziglio]

Check if some pointers are not NULL due to read errors or other problems

Signed-off-by: Frediano Ziglio <frediano.ziglio at citrix.com>
---
 core/fs/ext2/ext2.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/core/fs/ext2/ext2.c b/core/fs/ext2/ext2.c
index bddde8d..8f0f2a4 100644
--- a/core/fs/ext2/ext2.c
+++ b/core/fs/ext2/ext2.c
@@ -139,6 +139,8 @@ ext2_get_inode(struct fs_info *fs, int inr)
     block_off = inode_offset % EXT2_INODES_PER_BLOCK(fs);
 
     data = get_cache(fs->fs_dev, block_num);
+    if (!data)
+	return NULL;
 
     return (const struct ext2_inode *)
 	(data + block_off * EXT2_SB(fs)->s_inode_size);
@@ -164,7 +166,7 @@ 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 (!(inode = alloc_inode(fs, inr, sizeof(struct ext2_pvt_inode))))
+    if (!e_inode || !(inode = alloc_inode(fs, inr, sizeof(struct ext2_pvt_inode))))
 	return NULL;
     fill_inode(inode, e_inode);
 
-- 
1.7.5.4