commit 3f8a6411fbada1fa482276591e037f3b1adcf55b upstream.
Backported for 3.8 and 3.9-stable. Reverted ext4_get_group_number in bd86298.
From: Theodore Ts'o <tytso@xxxxxxx>
Addresses-Red-Hat-Bugzilla: #913245
Reported-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Reviewed-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Lingzhu Xiang <lxiang@xxxxxxxxxx>
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 1357260..3beae6a 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1882,6 +1882,10 @@ retry:
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 = num_desc_blocks(sb, n_group + 1);
--
1.7.11.7
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