Messages in this thread Patch in this message | | | Date | Thu, 14 May 2009 15:32:59 -0700 | From | Greg KH <> | Subject | [patch 24/51] cifs: Fix buffer size for tcon->nativeFileSystem field |
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2.6.29-stable review patch. If anyone has any objections, please let us know.
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From: Jeff Layton <jlayton@redhat.com>
Commit f083def68f84b04fe3f97312498911afce79609e refreshed.
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> Cc: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- fs/cifs/connect.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
--- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3667,16 +3667,12 @@ CIFSTCon(unsigned int xid, struct cifsSe BCC(smb_buffer_response)) { kfree(tcon->nativeFileSystem); tcon->nativeFileSystem = - kzalloc(2*(length + 1), GFP_KERNEL); + kzalloc((4 * length) + 2, GFP_KERNEL); if (tcon->nativeFileSystem) cifs_strfromUCS_le( tcon->nativeFileSystem, (__le16 *) bcc_ptr, length, nls_codepage); - bcc_ptr += 2 * length; - bcc_ptr[0] = 0; /* null terminate the string */ - bcc_ptr[1] = 0; - bcc_ptr += 2; } /* else do not bother copying these information fields*/ } else {
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