cifs: Limit memory used by lock request calls to a page

[ Upstream commit 92a8109e4d3a34fb6b115c9098b51767dc933444 ]

The code tries to allocate a contiguous buffer with a size supplied by
the server (maxBuf). This could fail if memory is fragmented since it
results in high order allocations for commonly used server
implementations. It is also wasteful since there are probably
few locks in the usual case. Limit the buffer to be no larger than a
page to avoid memory allocation failures due to fragmentation.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 7b637fc..23db881 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1128,6 +1128,10 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
                return -EINVAL;
        }
 
+       BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) >
+                    PAGE_SIZE);
+       max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr),
+                       PAGE_SIZE);
        max_num = (max_buf - sizeof(struct smb_hdr)) /
                                                sizeof(LOCKING_ANDX_RANGE);
        buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
@@ -1466,6 +1470,10 @@ cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
        if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE)))
                return -EINVAL;
 
+       BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) >
+                    PAGE_SIZE);
+       max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr),
+                       PAGE_SIZE);
        max_num = (max_buf - sizeof(struct smb_hdr)) /
                                                sizeof(LOCKING_ANDX_RANGE);
        buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);

diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c
index 2fc3d31..b204e84 100644 (file)
--- a/fs/cifs/smb2file.c
+++ b/fs/cifs/smb2file.c
@@ -128,6 +128,8 @@ smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
        if (max_buf < sizeof(struct smb2_lock_element))
                return -EINVAL;
 
+       BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
+       max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
        max_num = max_buf / sizeof(struct smb2_lock_element);
        buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
        if (!buf)
@@ -264,6 +266,8 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
                return -EINVAL;
        }
 
+       BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
+       max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
        max_num = max_buf / sizeof(struct smb2_lock_element);
        buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
        if (!buf) {