From: Theodore Ts'o <tytso@mit.edu>
Date: Sat, 29 May 1999 21:48:03 +0000 (+0000)
Subject: ChangeLog, openfs.c:
X-Git-Tag: E2FSPROGS-1_15~38
X-Git-Url: https://git.whamcloud.com/gitweb?a=commitdiff_plain;h=f0687a5e5724abf576c106e07363f2e437cc9883;p=tools%2Fe2fsprogs.git

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
--- 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
--- 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)