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cifs: fix buffer size for tcon->nativeFileSystem field 

The buffer for this was resized recently to fix a bug. It's still
possible however that a malicious server could overflow this field
by sending characters in it that are >2 bytes in the local charset.
Double the size of the buffer to account for this possibility.

Also get rid of some really strange and seemingly pointless NULL
termination. It's NULL terminating the string in the source buffer,
but by the time that happens, we've already copied the string.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2009-04-16 11:21:52 -04:00 committed by Steve French
parent 27b87fe52b
commit f083def68f
1 changed files with 2 additions and 5 deletions
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7
fs/cifs/connect.c
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@ -3756,16 +3756,13 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
BCC(smb_buffer_response)) { BCC(smb_buffer_response)) {
kfree(tcon->nativeFileSystem); kfree(tcon->nativeFileSystem);
tcon->nativeFileSystem = tcon->nativeFileSystem =
kzalloc(2*(length + 1), GFP_KERNEL); kzalloc((4 * length) + 2, GFP_KERNEL);
if (tcon->nativeFileSystem) if (tcon->nativeFileSystem)
cifs_strfromUCS_le( cifs_strfromUCS_le(
tcon->nativeFileSystem, tcon->nativeFileSystem,
(__le16 *) bcc_ptr, (__le16 *) bcc_ptr,
length, nls_codepage); length, nls_codepage);
bcc_ptr += 2 * length; bcc_ptr += (2 * length) + 2;
bcc_ptr[0] = 0; /* null terminate the string */
bcc_ptr[1] = 0;
bcc_ptr += 2;
} }
/* else do not bother copying these information fields*/ /* else do not bother copying these information fields*/
} else { } else {