diff options
Diffstat (limited to 'fs/ext4/fast_commit.c')
| -rw-r--r-- | fs/ext4/fast_commit.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c index da0c8228cf9c..1e8be0554239 100644 --- a/fs/ext4/fast_commit.c +++ b/fs/ext4/fast_commit.c @@ -737,6 +737,9 @@ static u8 *ext4_fc_reserve_space(struct super_block *sb, int len, u32 *crc) *crc = ext4_chksum(sbi, *crc, tl, EXT4_FC_TAG_BASE_LEN); if (pad_len > 0) ext4_fc_memzero(sb, tl + 1, pad_len, crc); + /* Don't leak uninitialized memory in the unused last byte. */ + *((u8 *)(tl + 1) + pad_len) = 0; + ext4_fc_submit_bh(sb, false); ret = jbd2_fc_get_buf(EXT4_SB(sb)->s_journal, &bh); @@ -793,6 +796,8 @@ static int ext4_fc_write_tail(struct super_block *sb, u32 crc) dst += sizeof(tail.fc_tid); tail.fc_crc = cpu_to_le32(crc); ext4_fc_memcpy(sb, dst, &tail.fc_crc, sizeof(tail.fc_crc), NULL); + dst += sizeof(tail.fc_crc); + memset(dst, 0, bsize - off); /* Don't leak uninitialized memory. */ ext4_fc_submit_bh(sb, true); |