ext4: fix incorrect group count in ext4_fill_super error message

commit df41460a21b06a76437af040d90ccee03888e8e5 upstream.

ext4_fill_super doublechecks the number of groups before mounting; if
that check fails, the resulting error message prints the group count
from the ext4_sb_info sbi, which hasn't been set yet. Print the freshly
computed group count instead (which at that point has just been computed
in "blocks_count").

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Fixes: 4ec1102813798 ("ext4: Add sanity checks for the superblock before mounting the filesystem")
Link: https://lore.kernel.org/r/8b957cd1513fcc4550fe675c10bcce2175c33a49.1585431964.git.josh@joshtriplett.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 71e2b80ff4aae28a85116420eb47a573b67d586d..df4d37545516f794ed49ec955b0f639bd2220c4e 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4241,9 +4241,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
                        EXT4_BLOCKS_PER_GROUP(sb) - 1);
        do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
        if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
-               ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
+               ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
                       "(block count %llu, first data block %u, "
-                      "blocks per group %lu)", sbi->s_groups_count,
+                      "blocks per group %lu)", blocks_count,
                       ext4_blocks_count(es),
                       le32_to_cpu(es->s_first_data_block),
                       EXT4_BLOCKS_PER_GROUP(sb));