tree b93b5ba3a9559d137fe7fb86f6d1a3d33189ce0b
parent 9418d5dc9ba40b88737580457bf3b7c63c60ec43
author Steve French <sfrench@us.ibm.com> 1194993697 +0000
committer Steve French <sfrench@us.ibm.com> 1194993697 +0000

[CIFS] Fix buffer overflow if server sends corrupt response to small
request

In SendReceive() function in transport.c - it memcpy's
message payload into a buffer passed via out_buf param. The function
assumes that all buffers are of size (CIFSMaxBufSize +
MAX_CIFS_HDR_SIZE) , unfortunately it is also called with smaller
(MAX_CIFS_SMALL_BUFFER_SIZE) buffers.  There are eight callers
(SMB worker functions) which are primarily affected by this change:

TreeDisconnect, uLogoff, Close, findClose, SetFileSize, SetFileTimes,
Lock and PosixLock

CC: Dave Kleikamp <shaggy@austin.ibm.com>
CC: Przemyslaw Wegrzyn <czajnik@czajsoft.pl>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>