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authorTheodore Ts'o <tytso@mit.edu>2013-04-21 22:56:32 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-04-21 22:56:32 -0400
commit3f8a6411fbada1fa482276591e037f3b1adcf55b (patch)
tree1ed53f3cd7e298876f5d8c81c261528ebbe077de /fs/ext4/resize.c
parent7f3e3c7cfcec148ccca9c0dd2dbfd7b00b7ac10f (diff)
downloadop-kernel-dev-3f8a6411fbada1fa482276591e037f3b1adcf55b.zip
op-kernel-dev-3f8a6411fbada1fa482276591e037f3b1adcf55b.tar.gz
ext4: add check for inodes_count overflow in new resize ioctl
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> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/resize.c')
-rw-r--r--fs/ext4/resize.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 08d2312..b27c96d 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1882,6 +1882,10 @@ retry:
return 0;
n_group = ext4_get_group_number(sb, n_blocks_count - 1);
+ 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);
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