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cifs: protect against server returning invalid file system block size

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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>
This commit is contained in:
Steve French 2018-09-15 14:07:09 -05:00
parent 2c887635cd
commit 5a519bead4
1 changed files with 21 additions and 0 deletions
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21
fs/cifs/cifssmb.c
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@ -5027,6 +5027,13 @@ SMBOldQFSInfo(const unsigned int xid, struct cifs_tcon *tcon,
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 @@ CIFSSMBQFSInfo(const unsigned int xid, struct cifs_tcon *tcon,
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 @@ CIFSSMBQFSPosixInfo(const unsigned int xid, struct cifs_tcon *tcon,
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 =