ext4: avoid eh_entries overflow before insert extent_idx

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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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Robin Dong 2011-07-17 23:43:42 -04:00 • committed by Theodore Ts'o

parent 015861badd

commit d46203159e

1 changed files with 10 additions and 8 deletions

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fs/ext4/extents.c

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