From: Robin Dong <hao.bigrat@gmail.com>
Date: Mon, 18 Jul 2011 03:43:42 +0000 (-0400)
Subject: ext4: avoid eh_entries overflow before insert extent_idx
X-Git-Tag: v3.1-rc1~90^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d46203159ed376fdbe2b05aa57e58207bf27a8f9;p=pandora-kernel.git

ext4: avoid eh_entries overflow before insert extent_idx

If eh_entries is equal to (or greater than) eh_max, the operation of
inserting new extent_idx will make number of entries overflow.
So check eh_entries before inserting the new extent_idx.

Although there is no bug case according the code (function
ext4_ext_insert_index is called by ext4_ext_split and ext4_ext_split
is called only if the index block has free space), the right logic
should be "lookup the capacity before insertion".

Signed-off-by: Robin Dong <sanbai@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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