From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 27 Mar 2018 03:54:10 +0000 (-0400)
Subject: ext4: add validity checks for bitmap block numbers
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f278235ce148485cdb9dc990673943addafbd577;p=pandora-kernel.git

ext4: add validity checks for bitmap block numbers

commit 7dac4a1726a9c64a517d595c40e95e2d0d135f6f upstream.

An privileged attacker can cause a crash by mounting a crafted ext4
image which triggers a out-of-bounds read in the function
ext4_valid_block_bitmap() in fs/ext4/balloc.c.

This issue has been assigned CVE-2018-1093.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199181
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1560782
Reported-by: Wen Xu <wen.xu@gatech.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
[bwh: Backported to 3.2:
 - In ext4_valid_block_bitmap(), goto err_out on error
 - In ext4_read_{block,inode}_bitmap(), return NULL on error
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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