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smb: client: serialise cifs_construct_tcon() with cifs_mount_mutex 

commit 93cee45ccfebc62a3bb4cd622b89e00c8c7d8493 upstream.

Serialise cifs_construct_tcon() with cifs_mount_mutex to handle
parallel mounts that may end up reusing the session and tcon created
by it.

Cc: stable@vger.kernel.org # 6.4+
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara 2024-04-01 22:44:09 -03:00 committed by Greg Kroah-Hartman
parent 9b2ee27e8d
commit ba55f8a995
3 changed files with 27 additions and 4 deletions
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13
fs/smb/client/connect.c
View File

@ -3981,7 +3981,7 @@ cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
}
static struct cifs_tcon *
cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
__cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
{
int rc;
struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
@ -4079,6 +4079,17 @@ out:
return tcon;
}
static struct cifs_tcon *
cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
{
struct cifs_tcon *ret;
cifs_mount_lock();
ret = __cifs_construct_tcon(cifs_sb, fsuid);
cifs_mount_unlock();
return ret;
}
struct cifs_tcon *
cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
{

6
fs/smb/client/fs_context.c
View File

@ -37,7 +37,7 @@
#include "rfc1002pdu.h"
#include "fs_context.h"
static DEFINE_MUTEX(cifs_mount_mutex);
DEFINE_MUTEX(cifs_mount_mutex);
static const match_table_t cifs_smb_version_tokens = {
{ Smb_1, SMB1_VERSION_STRING },
@ -752,9 +752,9 @@ static int smb3_get_tree(struct fs_context *fc)
if (err)
return err;
mutex_lock(&cifs_mount_mutex);
cifs_mount_lock();
ret = smb3_get_tree_common(fc);
mutex_unlock(&cifs_mount_mutex);
cifs_mount_unlock();
return ret;
}

12
fs/smb/client/fs_context.h
View File

@ -293,4 +293,16 @@ extern void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb);
#define MAX_CACHED_FIDS 16
extern char *cifs_sanitize_prepath(char *prepath, gfp_t gfp);
extern struct mutex cifs_mount_mutex;
static inline void cifs_mount_lock(void)
{
mutex_lock(&cifs_mount_mutex);
}
static inline void cifs_mount_unlock(void)
{
mutex_unlock(&cifs_mount_mutex);
}
#endif