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ext4: avoid stamping on other memories in ext4_ext_insert_index()

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Add a sanity check to make sure ix hasn't gone beyond the valid bounds
of the extent block.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Tao Ma 2011-10-17 10:13:46 -04:00 committed by Theodore Ts'o
parent d44651d0f9
commit f472e02669
1 changed files with 5 additions and 0 deletions
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5
fs/ext4/extents.c
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@ -779,6 +779,11 @@ static int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
ix = curp->p_idx;
}
if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) {
EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!");
return -EIO;
}
ix->ei_block = cpu_to_le32(logical);
ext4_idx_store_pblock(ix, ptr);
le16_add_cpu(&curp->p_hdr->eh_entries, 1);