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-rw-r--r--fs/isofs/rock.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index 977dd7009c0..9a81830abff 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -81,9 +81,22 @@ static void init_rock_state(struct rock_state *rs, struct inode *inode)
static int rock_continue(struct rock_state *rs)
{
int ret = 1;
+ int blocksize = 1 << rs->inode->i_blkbits;
+ const int min_de_size = offsetof(struct rock_ridge, u);
kfree(rs->buffer);
rs->buffer = NULL;
+
+ if ((unsigned)rs->cont_offset > blocksize - min_de_size ||
+ (unsigned)rs->cont_size > blocksize ||
+ (unsigned)(rs->cont_offset + rs->cont_size) > blocksize) {
+ printk(KERN_NOTICE "rock: corrupted directory entry. "
+ "extent=%d, offset=%d, size=%d\n",
+ rs->cont_extent, rs->cont_offset, rs->cont_size);
+ ret = -EIO;
+ goto out;
+ }
+
if (rs->cont_extent) {
struct buffer_head *bh;