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three client fixes, including two for stable

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Merge tag 'v6.11-rc3-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - fix for clang warning - additional null check

 - fix for cached write with posix locks

 - flexible structure fix

* tag 'v6.11-rc3-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  smb: smb2pdu.h: Use static_assert() to check struct sizes
  smb3: fix lock breakage for cached writes
  smb/client: avoid possible NULL dereference in cifs_free_subrequest()
This commit is contained in:
Linus Torvalds 2024-08-17 16:31:12 -07:00
commit e0fac5fc8b
2 changed files with 17 additions and 6 deletions
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21
fs/smb/client/file.c
View File

@ -316,7 +316,7 @@ static void cifs_free_subrequest(struct netfs_io_subrequest *subreq)
#endif
}
if (rdata->credits.value != 0)
if (rdata->credits.value != 0) {
trace_smb3_rw_credits(rdata->rreq->debug_id,
rdata->subreq.debug_index,
rdata->credits.value,
@ -324,8 +324,12 @@ static void cifs_free_subrequest(struct netfs_io_subrequest *subreq)
rdata->server ? rdata->server->in_flight : 0,
-rdata->credits.value,
cifs_trace_rw_credits_free_subreq);
if (rdata->server)
add_credits_and_wake_if(rdata->server, &rdata->credits, 0);
else
rdata->credits.value = 0;
}
add_credits_and_wake_if(rdata->server, &rdata->credits, 0);
if (rdata->have_xid)
free_xid(rdata->xid);
}
@ -2750,6 +2754,7 @@ cifs_writev(struct kiocb *iocb, struct iov_iter *from)
struct inode *inode = file->f_mapping->host;
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
ssize_t rc;
rc = netfs_start_io_write(inode);
@ -2766,12 +2771,16 @@ cifs_writev(struct kiocb *iocb, struct iov_iter *from)
if (rc <= 0)
goto out;
if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from),
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) &&
(cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from),
server->vals->exclusive_lock_type, 0,
NULL, CIFS_WRITE_OP))
rc = netfs_buffered_write_iter_locked(iocb, from, NULL);
else
NULL, CIFS_WRITE_OP))) {
rc = -EACCES;
goto out;
}
rc = netfs_buffered_write_iter_locked(iocb, from, NULL);
out:
up_read(&cinode->lock_sem);
netfs_end_io_write(inode);

2
fs/smb/common/smb2pdu.h
View File

@ -1216,6 +1216,8 @@ struct create_context {
);
__u8 Buffer[];
} __packed;
static_assert(offsetof(struct create_context, Buffer) == sizeof(struct create_context_hdr),
"struct member likely outside of __struct_group()");
struct smb2_create_req {
struct smb2_hdr hdr;