diff options
| author | Ross Lagerwall <ross.lagerwall@citrix.com> | 2019-01-08 19:30:56 +0100 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-01-11 14:14:40 +0100 |
| commit | 92a8109e4d3a34fb6b115c9098b51767dc933444 (patch) | |
| tree | bf25221c25731b147937ae58efdf15c54be3e19a /fs/cifs/smb2file.c | |
| parent | cifs: move large array from stack to heap (diff) | |
| download | linux-92a8109e4d3a34fb6b115c9098b51767dc933444.tar.xz linux-92a8109e4d3a34fb6b115c9098b51767dc933444.zip | |
cifs: Limit memory used by lock request calls to a page
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>
Diffstat (limited to 'fs/cifs/smb2file.c')
| -rw-r--r-- | fs/cifs/smb2file.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c index 4ed10dd086e6..eff01ed6db0a 100644 --- 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) 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) { |