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authorTheodore Ts'o <tytso@mit.edu>2010-05-30 22:50:01 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-02 10:21:22 -0700
commitb47b979f9d5c199e34a32d3fbbe64a7fbf1ddcb2 (patch)
treefc5598e198233ff5a7d53c521e3e04090d487662
parentb6eaf5813482cd0f7a26be329845518100097181 (diff)
ext4: Avoid crashing on NULL ptr dereference on a filesystem error
commit f70f362b4a6fe47c239dbfb3efc0cc2c10e4f09c upstream (as of v2.6.34-git13) If the EOFBLOCK_FL flag is set when it should not be and the inode is zero length, then eh_entries is zero, and ex is NULL, so dereferencing ex to print ex->ee_block causes a kernel OOPS in ext4_ext_map_blocks(). On top of that, the error message which is printed isn't very helpful. So we fix this by printing something more explanatory which doesn't involve trying to print ex->ee_block. Addresses-Google-Bug: #2655740 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/ext4/extents.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index ee9e2abb047c..d985da0215c7 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3281,8 +3281,8 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
*/
if (path[depth].p_ext == NULL && depth != 0) {
ext4_error(inode->i_sb, __func__, "bad extent address "
- "inode: %lu, iblock: %d, depth: %d",
- inode->i_ino, iblock, depth);
+ "inode: %lu, iblock: %lu, depth: %d",
+ inode->i_ino, (unsigned long) iblock, depth);
err = -EIO;
goto out2;
}
@@ -3418,8 +3418,11 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
} else {
WARN_ON(eh->eh_entries == 0);
ext4_error(inode->i_sb, __func__,
- "inode#%lu, eh->eh_entries = 0!", inode->i_ino);
- }
+ "inode#%lu, eh->eh_entries = 0 and "
+ "EOFBLOCKS_FL set", inode->i_ino);
+ err = -EIO;
+ goto out2;
+ }
}
err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
if (err) {