ChangeLog, openfs.c:

  openfs.c (ext2fs_open): Check to make sure that the number of blocks
  	per group is not zero --- if so, it must be a bad superblock!

diff --git a/lib/ext2fs/ChangeLog b/lib/ext2fs/ChangeLog
index a0bba4f..3e6c4c4 100644 (file)
--- a/lib/ext2fs/ChangeLog
+++ b/lib/ext2fs/ChangeLog
@@ -1,3 +1,9 @@
+1999-05-03    <tytso@rsts-11.mit.edu>
+
+       * openfs.c (ext2fs_open): Check to make sure that the number of
+               blocks per group is not zero --- if so, it must be a bad
+               superblock!
+
 1999-01-09  Theodore Ts'o  <tytso@rsts-11.mit.edu>
 
        * Release of E2fsprogs 1.14

diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
index 54aeedc..b0b433f 100644 (file)
--- a/lib/ext2fs/openfs.c
+++ b/lib/ext2fs/openfs.c
@@ -163,6 +163,10 @@ errcode_t ext2fs_open(const char *name, int flags, int superblock,
        /*
         * Read group descriptors
         */
+       if ((EXT2_BLOCKS_PER_GROUP(fs->super)) == 0) {
+               retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+               goto cleanup;
+       }
        fs->group_desc_count = (fs->super->s_blocks_count -
                                fs->super->s_first_data_block +
                                EXT2_BLOCKS_PER_GROUP(fs->super) - 1)