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staging: lustre: echo_copy.._lsm() dereferences userland pointers directly

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commit 9225c0b7b9 upstream.

missing get_user()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro
2015-12-01 19:52:12 +00:00
committed by Greg Kroah-Hartman
parent b50a2b556d
commit 3f0cf7dcf7
1 changed files with 11 additions and 9 deletions
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20
drivers/staging/lustre/lustre/obdecho/echo_client.c
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@@ -1268,6 +1268,7 @@ static int
echo_copyout_lsm(struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
{
struct lov_stripe_md *ulsm = _ulsm;
struct lov_oinfo **p;
int nob, i;
nob = offsetof(struct lov_stripe_md, lsm_oinfo[lsm->lsm_stripe_count]);
@@ -1277,9 +1278,10 @@ echo_copyout_lsm(struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
if (copy_to_user(ulsm, lsm, sizeof(*ulsm)))
return -EFAULT;
for (i = 0; i < lsm->lsm_stripe_count; i++) {
if (copy_to_user(ulsm->lsm_oinfo[i], lsm->lsm_oinfo[i],
sizeof(lsm->lsm_oinfo[0])))
for (i = 0, p = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++, p++) {
struct lov_oinfo __user *up;
if (get_user(up, ulsm->lsm_oinfo + i) ||
copy_to_user(up, *p, sizeof(struct lov_oinfo)))
return -EFAULT;
}
return 0;
@@ -1287,9 +1289,10 @@ echo_copyout_lsm(struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
static int
echo_copyin_lsm(struct echo_device *ed, struct lov_stripe_md *lsm,
void *ulsm, int ulsm_nob)
struct lov_stripe_md __user *ulsm, int ulsm_nob)
{
struct echo_client_obd *ec = ed->ed_ec;
struct lov_oinfo **p;
int i;
if (ulsm_nob < sizeof(*lsm))
@@ -1305,11 +1308,10 @@ echo_copyin_lsm(struct echo_device *ed, struct lov_stripe_md *lsm,
return -EINVAL;
for (i = 0; i < lsm->lsm_stripe_count; i++) {
if (copy_from_user(lsm->lsm_oinfo[i],
((struct lov_stripe_md *)ulsm)-> \
lsm_oinfo[i],
sizeof(lsm->lsm_oinfo[0])))
for (i = 0, p = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++, p++) {
struct lov_oinfo __user *up;
if (get_user(up, ulsm->lsm_oinfo + i) ||
copy_from_user(*p, up, sizeof(struct lov_oinfo)))
return -EFAULT;
}
return 0;