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authorSteve French <sfrench@us.ibm.com>2010-02-06 07:08:53 +0000
committerSteve French <sfrench@us.ibm.com>2010-02-06 07:08:53 +0000
commit301a6a317797ca362951ea21da397c05236f0070 (patch)
tree14742eb9a7fe51b854a1a6bd6f3efa89c53aa51e
parentf12f98dba6ea1517cd7fbb912208893b9c014c15 (diff)
[CIFS] Maximum username length check in session setup does not match
Fix length check reported by D. Binderman (see below) d binderman <dcb314@hotmail.com> wrote: > > I just ran the sourceforge tool cppcheck over the source code of the > new Linux kernel 2.6.33-rc6 > > It said > > [./cifs/sess.c:250]: (error) Buffer access out-of-bounds May turn out to be harmless, but best to be safe. Note max username length is defined to 32 due to Linux (Windows maximum is 20). Signed-off-by: Steve French <sfrench@us.ibm.com>
-rw-r--r--fs/cifs/sess.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 7085a6275c4..aaa9c1c5a5b 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -223,9 +223,9 @@ static void unicode_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses,
/* null user mount */
*bcc_ptr = 0;
*(bcc_ptr+1) = 0;
- } else { /* 300 should be long enough for any conceivable user name */
+ } else {
bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName,
- 300, nls_cp);
+ MAX_USERNAME_SIZE, nls_cp);
}
bcc_ptr += 2 * bytes_ret;
bcc_ptr += 2; /* account for null termination */
@@ -246,11 +246,10 @@ static void ascii_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses,
/* copy user */
if (ses->userName == NULL) {
/* BB what about null user mounts - check that we do this BB */
- } else { /* 300 should be long enough for any conceivable user name */
- strncpy(bcc_ptr, ses->userName, 300);
+ } else {
+ strncpy(bcc_ptr, ses->userName, MAX_USERNAME_SIZE);
}
- /* BB improve check for overflow */
- bcc_ptr += strnlen(ses->userName, 300);
+ bcc_ptr += strnlen(ses->userName, MAX_USERNAME_SIZE);
*bcc_ptr = 0;
bcc_ptr++; /* account for null termination */