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Diffstat (limited to 'fs/squashfs/fragment.c')
-rw-r--r--fs/squashfs/fragment.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/squashfs/fragment.c b/fs/squashfs/fragment.c
index 86ad9a4b8c36..0681feab4a84 100644
--- a/fs/squashfs/fragment.c
+++ b/fs/squashfs/fragment.c
@@ -49,11 +49,16 @@ int squashfs_frag_lookup(struct super_block *sb, unsigned int fragment,
u64 *fragment_block)
{
struct squashfs_sb_info *msblk = sb->s_fs_info;
- int block = SQUASHFS_FRAGMENT_INDEX(fragment);
- int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
- u64 start_block = le64_to_cpu(msblk->fragment_index[block]);
+ int block, offset, size;
struct squashfs_fragment_entry fragment_entry;
- int size;
+ u64 start_block;
+
+ if (fragment >= msblk->fragments)
+ return -EIO;
+ block = SQUASHFS_FRAGMENT_INDEX(fragment);
+ offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
+
+ start_block = le64_to_cpu(msblk->fragment_index[block]);
size = squashfs_read_metadata(sb, &fragment_entry, &start_block,
&offset, sizeof(fragment_entry));