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| author |   Javier Pello <javier.pello@urjc.es> | 2021-07-14 18:54:48 +0200 |
|---|---|---|
| committer |   Jan Kara <jack@suse.cz> | 2021-07-16 12:36:51 +0200 |
| commit | 728d392f8a799f037812d0f2b254fb3b5e115fcf (patch) | |
| tree | f7786885c6af432e6314b24afde73f34a8705663 /fs/ext2/namei.c | |
| parent | reiserfs: add check for root_inode in reiserfs_fill_super (diff) | |
| download | linux-dev-728d392f8a799f037812d0f2b254fb3b5e115fcf.tar.xz linux-dev-728d392f8a799f037812d0f2b254fb3b5e115fcf.zip | |
fs/ext2: Avoid page_address on pages returned by ext2_get_page
Commit 782b76d7abdf02b12c46ed6f1e9bf715569027f7 ("fs/ext2: Replace
kmap() with kmap_local_page()") replaced the kmap/kunmap calls in
ext2_get_page/ext2_put_page with kmap_local_page/kunmap_local for
efficiency reasons. As a necessary side change, the commit also
made ext2_get_page (and ext2_find_entry and ext2_dotdot) return
the mapping address along with the page itself, as it is required
for kunmap_local, and converted uses of page_address on such pages
to use the newly returned address instead. However, uses of
page_address on such pages were missed in ext2_check_page and
ext2_delete_entry, which triggers oopses if kmap_local_page happens
to return an address from high memory. Fix this now by converting
the remaining uses of page_address to use the right address, as
returned by kmap_local_page.
Link: https://lore.kernel.org/r/20210714185448.8707ac239e9f12b3a7f5b9f9@urjc.es
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Javier Pello <javier.pello@urjc.es>
Fixes: 782b76d7abdf ("fs/ext2: Replace kmap() with kmap_local_page()")
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext2/namei.c')
| -rw-r--r-- | fs/ext2/namei.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c index 1f69b81655b6..5f6b7560eb3f 100644 --- a/fs/ext2/namei.c +++ b/fs/ext2/namei.c @@ -293,7 +293,7 @@ static int ext2_unlink(struct inode * dir, struct dentry *dentry) goto out; } - err = ext2_delete_entry (de, page); + err = ext2_delete_entry (de, page, page_addr); ext2_put_page(page, page_addr); if (err) goto out; @@ -397,7 +397,7 @@ static int ext2_rename (struct user_namespace * mnt_userns, old_inode->i_ctime = current_time(old_inode); mark_inode_dirty(old_inode); - ext2_delete_entry(old_de, old_page); + ext2_delete_entry(old_de, old_page, old_page_addr); if (dir_de) { if (old_dir != new_dir) |