diff options
| author | Aurelien Aptel <aaptel@suse.com> | 2018-06-04 23:29:35 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-06-07 16:31:31 +0300 |
| commit | 8ddecf5fd728d3c6373394fa647d28e7c27f93a7 (patch) | |
| tree | df3913e2cb697e31eebca8180ea37180fbc36b8b | |
| parent | 83210ba6f816823f1762fbe63bd4985d6274d205 (diff) | |
| download | linux-8ddecf5fd728d3c6373394fa647d28e7c27f93a7.tar.xz | |
CIFS: Fix NULL ptr deref
cifs->master_tlink is NULL against Win Server 2016 (which is
strange.. not sure why) and is dereferenced in cifs_sb_master_tcon().
move master_tlink getter to cifsglob.h so it can be used from
smb2misc.c
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
| -rw-r--r-- | fs/cifs/cifsglob.h | 6 | ||||
| -rw-r--r-- | fs/cifs/connect.c | 6 | ||||
| -rw-r--r-- | fs/cifs/smb2misc.c | 4 |
3 files changed, 9 insertions, 7 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 08d1cdd96701..1efa2e65bc1a 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -1019,6 +1019,12 @@ tlink_tcon(struct tcon_link *tlink) return tlink->tl_tcon; } +static inline struct tcon_link * +cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) +{ + return cifs_sb->master_tlink; +} + extern void cifs_put_tlink(struct tcon_link *tlink); static inline struct tcon_link * diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index e5a2fe7f0dd4..9089b73809de 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3116,12 +3116,6 @@ cifs_put_tlink(struct tcon_link *tlink) return; } -static inline struct tcon_link * -cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) -{ - return cifs_sb->master_tlink; -} - static int compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data) { diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c index cb5728e3d87d..e2bec47c6845 100644 --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -453,8 +453,10 @@ cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb) start_of_path = from + 1; #ifdef CONFIG_CIFS_SMB311 /* SMB311 POSIX extensions paths do not include leading slash */ - else if (cifs_sb_master_tcon(cifs_sb)->posix_extensions) + else if (cifs_sb_master_tlink(cifs_sb) && + cifs_sb_master_tcon(cifs_sb)->posix_extensions) { start_of_path = from + 1; + } #endif /* 311 */ else start_of_path = from; |