From: Ye Bin yebin10@huawei.com
[ Upstream commit dcc5827484d6e53ccda12334f8bbfafcc593ceda ]
Factor out ext4_fc_get_tl() to fill 'tl' with host byte order.
Signed-off-by: Ye Bin yebin10@huawei.com Link: https://lore.kernel.org/r/20220924075233.2315259-3-yebin10@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Stable-dep-of: 1b45cc5c7b92 ("ext4: fix potential out of bound read in ext4_fc_replay_scan()") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ext4/fast_commit.c | 46 +++++++++++++++++++++++-------------------- 1 file changed, 25 insertions(+), 21 deletions(-)
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c index 6c8b78ad0ff2..f518c6585a63 100644 --- a/fs/ext4/fast_commit.c +++ b/fs/ext4/fast_commit.c @@ -1346,7 +1346,7 @@ struct dentry_info_args { };
static inline void tl_to_darg(struct dentry_info_args *darg, - struct ext4_fc_tl *tl, u8 *val) + struct ext4_fc_tl *tl, u8 *val) { struct ext4_fc_dentry_info fcd;
@@ -1355,8 +1355,14 @@ static inline void tl_to_darg(struct dentry_info_args *darg, darg->parent_ino = le32_to_cpu(fcd.fc_parent_ino); darg->ino = le32_to_cpu(fcd.fc_ino); darg->dname = val + offsetof(struct ext4_fc_dentry_info, fc_dname); - darg->dname_len = le16_to_cpu(tl->fc_len) - - sizeof(struct ext4_fc_dentry_info); + darg->dname_len = tl->fc_len - sizeof(struct ext4_fc_dentry_info); +} + +static inline void ext4_fc_get_tl(struct ext4_fc_tl *tl, u8 *val) +{ + memcpy(tl, val, EXT4_FC_TAG_BASE_LEN); + tl->fc_len = le16_to_cpu(tl->fc_len); + tl->fc_tag = le16_to_cpu(tl->fc_tag); }
/* Unlink replay function */ @@ -1521,7 +1527,7 @@ static int ext4_fc_replay_inode(struct super_block *sb, struct ext4_fc_tl *tl, struct ext4_inode *raw_fc_inode; struct inode *inode = NULL; struct ext4_iloc iloc; - int inode_len, ino, ret, tag = le16_to_cpu(tl->fc_tag); + int inode_len, ino, ret, tag = tl->fc_tag; struct ext4_extent_header *eh;
memcpy(&fc_inode, val, sizeof(fc_inode)); @@ -1546,7 +1552,7 @@ static int ext4_fc_replay_inode(struct super_block *sb, struct ext4_fc_tl *tl, if (ret) goto out;
- inode_len = le16_to_cpu(tl->fc_len) - sizeof(struct ext4_fc_inode); + inode_len = tl->fc_len - sizeof(struct ext4_fc_inode); raw_inode = ext4_raw_inode(&iloc);
memcpy(raw_inode, raw_fc_inode, offsetof(struct ext4_inode, i_block)); @@ -2037,12 +2043,12 @@ static int ext4_fc_replay_scan(journal_t *journal,
state->fc_replay_expected_off++; for (cur = start; cur < end; - cur = cur + EXT4_FC_TAG_BASE_LEN + le16_to_cpu(tl.fc_len)) { - memcpy(&tl, cur, EXT4_FC_TAG_BASE_LEN); + cur = cur + EXT4_FC_TAG_BASE_LEN + tl.fc_len) { + ext4_fc_get_tl(&tl, cur); val = cur + EXT4_FC_TAG_BASE_LEN; ext4_debug("Scan phase, tag:%s, blk %lld\n", - tag2str(le16_to_cpu(tl.fc_tag)), bh->b_blocknr); - switch (le16_to_cpu(tl.fc_tag)) { + tag2str(tl.fc_tag), bh->b_blocknr); + switch (tl.fc_tag) { case EXT4_FC_TAG_ADD_RANGE: memcpy(&ext, val, sizeof(ext)); ex = (struct ext4_extent *)&ext.fc_ex; @@ -2062,7 +2068,7 @@ static int ext4_fc_replay_scan(journal_t *journal, case EXT4_FC_TAG_PAD: state->fc_cur_tag++; state->fc_crc = ext4_chksum(sbi, state->fc_crc, cur, - EXT4_FC_TAG_BASE_LEN + le16_to_cpu(tl.fc_len)); + EXT4_FC_TAG_BASE_LEN + tl.fc_len); break; case EXT4_FC_TAG_TAIL: state->fc_cur_tag++; @@ -2095,7 +2101,7 @@ static int ext4_fc_replay_scan(journal_t *journal, } state->fc_cur_tag++; state->fc_crc = ext4_chksum(sbi, state->fc_crc, cur, - EXT4_FC_TAG_BASE_LEN + le16_to_cpu(tl.fc_len)); + EXT4_FC_TAG_BASE_LEN + tl.fc_len); break; default: ret = state->fc_replay_num_tags ? @@ -2151,8 +2157,8 @@ static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh, end = (__u8 *)bh->b_data + journal->j_blocksize - 1;
for (cur = start; cur < end; - cur = cur + EXT4_FC_TAG_BASE_LEN + le16_to_cpu(tl.fc_len)) { - memcpy(&tl, cur, EXT4_FC_TAG_BASE_LEN); + cur = cur + EXT4_FC_TAG_BASE_LEN + tl.fc_len) { + ext4_fc_get_tl(&tl, cur); val = cur + EXT4_FC_TAG_BASE_LEN;
if (state->fc_replay_num_tags == 0) { @@ -2160,10 +2166,9 @@ static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh, ext4_fc_set_bitmaps_and_counters(sb); break; } - ext4_debug("Replay phase, tag:%s\n", - tag2str(le16_to_cpu(tl.fc_tag))); + ext4_debug("Replay phase, tag:%s\n", tag2str(tl.fc_tag)); state->fc_replay_num_tags--; - switch (le16_to_cpu(tl.fc_tag)) { + switch (tl.fc_tag) { case EXT4_FC_TAG_LINK: ret = ext4_fc_replay_link(sb, &tl, val); break; @@ -2184,19 +2189,18 @@ static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh, break; case EXT4_FC_TAG_PAD: trace_ext4_fc_replay(sb, EXT4_FC_TAG_PAD, 0, - le16_to_cpu(tl.fc_len), 0); + tl.fc_len, 0); break; case EXT4_FC_TAG_TAIL: - trace_ext4_fc_replay(sb, EXT4_FC_TAG_TAIL, 0, - le16_to_cpu(tl.fc_len), 0); + trace_ext4_fc_replay(sb, EXT4_FC_TAG_TAIL, + 0, tl.fc_len, 0); memcpy(&tail, val, sizeof(tail)); WARN_ON(le32_to_cpu(tail.fc_tid) != expected_tid); break; case EXT4_FC_TAG_HEAD: break; default: - trace_ext4_fc_replay(sb, le16_to_cpu(tl.fc_tag), 0, - le16_to_cpu(tl.fc_len), 0); + trace_ext4_fc_replay(sb, tl.fc_tag, 0, tl.fc_len, 0); ret = -ECANCELED; break; }