diff options
| author | Steve French <stfrench@microsoft.com> | 2018-09-15 14:07:09 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-10-23 21:16:04 -0500 |
| commit | 5a519bead49938aa0e3086bc753930d610fbd705 (patch) | |
| tree | b918add3eb0344a338b749e3f089e9ac44e02bb6 /fs/cifs/cifssmb.c | |
| parent | 2c887635cd6ab3af619dc2be94e5bf8f2e172b78 (diff) | |
| download | linux-5a519bead49938aa0e3086bc753930d610fbd705.tar.bz2 | |
cifs: protect against server returning invalid file system block size
For a network file system we generally prefer large i/o, but
if the server returns invalid file system block/sector sizes
in cifs (vers=1.0) QFSInfo then set block size to a default
of a reasonable minimum (4K).
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Diffstat (limited to 'fs/cifs/cifssmb.c')
| -rw-r--r-- | fs/cifs/cifssmb.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 5657b79dbc99..41329f41a599 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -5027,6 +5027,13 @@ oldQFSInfoRetry: le16_to_cpu(response_data->BytesPerSector) * le32_to_cpu(response_data-> SectorsPerAllocationUnit); + /* + * much prefer larger but if server doesn't report + * a valid size than 4K is a reasonable minimum + */ + if (FSData->f_bsize < 512) + FSData->f_bsize = 4096; + FSData->f_blocks = le32_to_cpu(response_data->TotalAllocationUnits); FSData->f_bfree = FSData->f_bavail = @@ -5107,6 +5114,13 @@ QFSInfoRetry: le32_to_cpu(response_data->BytesPerSector) * le32_to_cpu(response_data-> SectorsPerAllocationUnit); + /* + * much prefer larger but if server doesn't report + * a valid size than 4K is a reasonable minimum + */ + if (FSData->f_bsize < 512) + FSData->f_bsize = 4096; + FSData->f_blocks = le64_to_cpu(response_data->TotalAllocationUnits); FSData->f_bfree = FSData->f_bavail = @@ -5470,6 +5484,13 @@ QFSPosixRetry: data_offset); FSData->f_bsize = le32_to_cpu(response_data->BlockSize); + /* + * much prefer larger but if server doesn't report + * a valid size than 4K is a reasonable minimum + */ + if (FSData->f_bsize < 512) + FSData->f_bsize = 4096; + FSData->f_blocks = le64_to_cpu(response_data->TotalBlocks); FSData->f_bfree = |