From: Navid Emamdoost navid.emamdoost@gmail.com
[ Upstream commit e0b0cb9388642c104838fac100a4af32745621e2 ]
In hgcm_call_preprocess_linaddr memory is allocated for bounce_buf but is not released if copy_form_user fails. In order to prevent memory leak in case of failure, the assignment to bounce_buf_ret is moved before the error check. This way the allocated bounce_buf will be released by the caller.
Fixes: 579db9d45cb4 ("virt: Add vboxguest VMMDEV communication code") Signed-off-by: Navid Emamdoost navid.emamdoost@gmail.com Reviewed-by: Hans de Goede hdegoede@redhat.com Link: https://lore.kernel.org/r/20190930204223.3660-1-navid.emamdoost@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/virt/vboxguest/vboxguest_utils.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/virt/vboxguest/vboxguest_utils.c b/drivers/virt/vboxguest/vboxguest_utils.c index 75fd140b02ff8..43c391626a000 100644 --- a/drivers/virt/vboxguest/vboxguest_utils.c +++ b/drivers/virt/vboxguest/vboxguest_utils.c @@ -220,6 +220,8 @@ static int hgcm_call_preprocess_linaddr( if (!bounce_buf) return -ENOMEM;
+ *bounce_buf_ret = bounce_buf; + if (copy_in) { ret = copy_from_user(bounce_buf, (void __user *)buf, len); if (ret) @@ -228,7 +230,6 @@ static int hgcm_call_preprocess_linaddr( memset(bounce_buf, 0, len); }
- *bounce_buf_ret = bounce_buf; hgcm_call_add_pagelist_size(bounce_buf, len, extra); return 0; }