[PATCH 0/1] fs: ext4fs: Fix: Data abort in ext4fs_log_gdt()

[Tony Dinh]

Currently, the number of EXT4 journal entries is defined as a constant,
MAX_JOURNAL_ENTRIES = 100. When the HDD is greater than 2TB in capacity,
the number of blocks per gdt (no_blk_pergdt) is a lot larger than 100.
So the function ext4fs_log_gdt causes an array index out-of-bound in the
journal log (journal_ptr[MAX_JOURNAL_ENTRIES]), and results in a data
abort.

This was tested with the Synology DS116 (32-bit Armada 385 SoC) board,
and a 4TB Seagate HDD.



Tony Dinh (1):
  fs: ext4fs: Fix: Data abort in ext4fs_log_gdt()

 fs/ext4/ext4_journal.c | 7 +++++++
 1 file changed, 7 insertions(+)

-- 
2.39.5

base-commit: e9f852f7fd2481579bb3521c13663d33a7f22eef
branch: master