1 files changed, 19 insertions, 13 deletions

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 5bc71d9a674a..a445d599098d 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -750,7 +750,7 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
         /* Are we beyond EOF? */
         if (etype == -1) {
                 int ret;
-                isBeyondEOF = 1;
+                isBeyondEOF = true;
                 if (count) {
                         if (c)
                                 laarr[0] = laarr[1];
@@ -792,7 +792,7 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
                 endnum = c + 1;
                 lastblock = 1;
         } else {
-                isBeyondEOF = 0;
+                isBeyondEOF = false;
                 endnum = startnum = ((count > 2) ? 2 : count);
 
                 /* if the current extent is in position 0,
@@ -1288,6 +1288,7 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode)
         struct kernel_lb_addr *iloc = &iinfo->i_location;
         unsigned int link_count;
         unsigned int indirections = 0;
+        int bs = inode->i_sb->s_blocksize;
         int ret = -EIO;
 
 reread:
@@ -1374,38 +1375,35 @@ reread:
         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
                 iinfo->i_efe = 1;
                 iinfo->i_use = 0;
-                ret = udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
+                ret = udf_alloc_i_data(inode, bs -
                                         sizeof(struct extendedFileEntry));
                 if (ret)
                         goto out;
                 memcpy(iinfo->i_ext.i_data,
                        bh->b_data + sizeof(struct extendedFileEntry),
-                       inode->i_sb->s_blocksize -
-                                        sizeof(struct extendedFileEntry));
+                       bs - sizeof(struct extendedFileEntry));
         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
                 iinfo->i_efe = 0;
                 iinfo->i_use = 0;
-                ret = udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
-                                                sizeof(struct fileEntry));
+                ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
                 if (ret)
                         goto out;
                 memcpy(iinfo->i_ext.i_data,
                        bh->b_data + sizeof(struct fileEntry),
-                       inode->i_sb->s_blocksize - sizeof(struct fileEntry));
+                       bs - sizeof(struct fileEntry));
         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
                 iinfo->i_efe = 0;
                 iinfo->i_use = 1;
                 iinfo->i_lenAlloc = le32_to_cpu(
                                 ((struct unallocSpaceEntry *)bh->b_data)->
                                  lengthAllocDescs);
-                ret = udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
+                ret = udf_alloc_i_data(inode, bs -
                                         sizeof(struct unallocSpaceEntry));
                 if (ret)
                         goto out;
                 memcpy(iinfo->i_ext.i_data,
                        bh->b_data + sizeof(struct unallocSpaceEntry),
-                       inode->i_sb->s_blocksize -
-                                        sizeof(struct unallocSpaceEntry));
+                       bs - sizeof(struct unallocSpaceEntry));
                 return 0;
         }
 
@@ -1489,6 +1487,15 @@ reread:
         }
         inode->i_generation = iinfo->i_unique;
 
+        /*
+         * Sanity check length of allocation descriptors and extended attrs to
+         * avoid integer overflows
+         */
+        if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
+                goto out;
+        /* Now do exact checks */
+        if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
+                goto out;
         /* Sanity checks for files in ICB so that we don't get confused later */
         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
                 /*
@@ -1498,8 +1505,7 @@ reread:
                 if (iinfo->i_lenAlloc != inode->i_size)
                         goto out;
                 /* File in ICB has to fit in there... */
-                if (inode->i_size > inode->i_sb->s_blocksize -
-                                        udf_file_entry_alloc_offset(inode))
+                if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
                         goto out;
         }