1 files changed, 15 insertions, 0 deletions

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 8d0b3ade0ff0..566df9b5a6cb 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -2047,14 +2047,29 @@ void udf_write_aext(struct inode *inode, struct extent_position *epos,
                 epos->offset += adsize;
 }
 
+/*
+ * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
+ * someone does some weird stuff.
+ */
+#define UDF_MAX_INDIR_EXTS 16
+
 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
 {
         int8_t etype;
+        unsigned int indirections = 0;
 
         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
                 int block;
+
+                if (++indirections > UDF_MAX_INDIR_EXTS) {
+                        udf_err(inode->i_sb,
+                                "too many indirect extents in inode %lu\n",
+                                inode->i_ino);
+                        return -1;
+                }
+
                 epos->block = *eloc;
                 epos->offset = sizeof(struct allocExtDesc);
                 brelse(epos->bh);