| From | Luis Henriques <> | Subject | [PATCH 059/115] ext4: add check for inodes_count overflow in new resize ioctl | Date | Mon, 20 May 2013 11:50:59 +0100 |
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3.5.7.13 -stable review patch. If anyone has any objections, please let me know.
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From: Theodore Ts'o <tytso@mit.edu>
commit 3f8a6411fbada1fa482276591e037f3b1adcf55b upstream.
Addresses-Red-Hat-Bugzilla: #913245
Reported-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- fs/ext4/resize.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 097a7b0..d0ba1a9 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1680,6 +1680,10 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) return 0; ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &offset); + if (n_group > (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { + ext4_warning(sb, "resize would cause inodes_count overflow"); + return -EINVAL; + } ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); n_desc_blocks = (n_group + EXT4_DESC_PER_BLOCK(sb)) / -- 1.8.1.2
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