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| author | Jeremy Allison <jra@samba.org> | 2013-08-02 17:05:58 -0700 |
|---|---|---|
| committer | David Disseldorp <ddiss@samba.org> | 2013-08-04 16:54:04 +0200 |
| commit | b35a27b77954992fc1e6db446bbfa6cfbb7547a1 (patch) | |
| tree | 712da5edf6a92054d4651d8957af87fe46438b7a /source3/smbd | |
| parent | 852c9ac34dbef66d0b2619554c611157c2fab771 (diff) | |
| download | samba-b35a27b77954992fc1e6db446bbfa6cfbb7547a1.tar.gz samba-b35a27b77954992fc1e6db446bbfa6cfbb7547a1.tar.bz2 samba-b35a27b77954992fc1e6db446bbfa6cfbb7547a1.zip | |
Ensure we can never integer wrap when working on client-supplied max_data_bytes.
This would only be possible with SMB2, and is already checked in the upper
SMB2 layers, but it really doesn't hurt to have these extra checks at time
of use also.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Sun Aug 4 16:54:04 CEST 2013 on sn-devel-104
Diffstat (limited to 'source3/smbd')
| -rw-r--r-- | source3/smbd/trans2.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/source3/smbd/trans2.c b/source3/smbd/trans2.c index a216f15cd3..f7691044a1 100644 --- a/source3/smbd/trans2.c +++ b/source3/smbd/trans2.c @@ -2564,6 +2564,11 @@ total_data=%u (should be %u)\n", (unsigned int)total_data, (unsigned int)IVAL(pd } } + if (max_data_bytes + DIR_ENTRY_SAFETY_MARGIN < max_data_bytes) { + reply_nterror(req, NT_STATUS_INVALID_PARAMETER); + goto out; + } + *ppdata = (char *)SMB_REALLOC( *ppdata, max_data_bytes + DIR_ENTRY_SAFETY_MARGIN); if(*ppdata == NULL ) { @@ -2893,6 +2898,11 @@ total_data=%u (should be %u)\n", (unsigned int)total_data, (unsigned int)IVAL(pd } } + if (max_data_bytes + DIR_ENTRY_SAFETY_MARGIN < max_data_bytes) { + reply_nterror(req, NT_STATUS_INVALID_PARAMETER); + return; + } + *ppdata = (char *)SMB_REALLOC( *ppdata, max_data_bytes + DIR_ENTRY_SAFETY_MARGIN); if(*ppdata == NULL) { @@ -3150,6 +3160,10 @@ NTSTATUS smbd_do_qfsinfo(connection_struct *conn, st = smb_fname.st; + if (max_data_bytes + DIR_ENTRY_SAFETY_MARGIN < max_data_bytes) { + return NT_STATUS_INVALID_PARAMETER; + } + *ppdata = (char *)SMB_REALLOC( *ppdata, max_data_bytes + DIR_ENTRY_SAFETY_MARGIN); if (*ppdata == NULL) { @@ -4368,6 +4382,10 @@ static void call_trans2qpipeinfo(connection_struct *conn, } params = *pparams; SSVAL(params,0,0); + if (max_data_bytes + DIR_ENTRY_SAFETY_MARGIN < max_data_bytes) { + reply_nterror(req, NT_STATUS_INVALID_PARAMETER); + return; + } data_size = max_data_bytes + DIR_ENTRY_SAFETY_MARGIN; *ppdata = (char *)SMB_REALLOC(*ppdata, data_size); if (*ppdata == NULL ) { @@ -4449,6 +4467,10 @@ NTSTATUS smbd_do_qfilepathinfo(connection_struct *conn, nlink -= 1; } + if (max_data_bytes + DIR_ENTRY_SAFETY_MARGIN < max_data_bytes) { + return NT_STATUS_INVALID_PARAMETER; + } + data_size = max_data_bytes + DIR_ENTRY_SAFETY_MARGIN; *ppdata = (char *)SMB_REALLOC(*ppdata, data_size); if (*ppdata == NULL) { |