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ext4: Do not crash when trying to grow a directory using extents

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The following command crashes u-boot:
./sandbox/u-boot -c 'i=0; host bind 0 ./sandbox/test/fs/3GB.ext4.img ;
  while test $i -lt 200 ; do echo $i; setexpr i $i + 1;
  ext4write host 0 0 /foobar${i} 0; done'

Previously, the code updated the direct_block even for extents, and
fortunately crashed before pushing garbage to the disk.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
This commit is contained in:
Stefan Brüns 2016-09-06 04:36:43 +02:00 • committed by Tom Rini
parent a0d767e2c1
commit b96c3c7292
1 changed files with 6 additions and 1 deletions
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7
fs/ext4/ext4_common.c
View file

@ -453,8 +453,13 @@ restart:
sizeof(struct ext2_dirent) + padding_factor;
if ((fs->blksz - totalbytes - last_entry_dirlen) <
new_entry_byte_reqd) {
printf("1st Block Full:Allocate new block\n");
printf("Last Block Full:Allocate new block\n");
if (le32_to_cpu(g_parent_inode->flags) &
EXT4_EXTENTS_FL) {
printf("Directory uses extents\n");
goto fail;
}
if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
printf("Directory exceeds limit\n");
goto fail;