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virt: vbox: fix memory leak in hgcm_call_preprocess_linaddr 

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: 579db9d45c ("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>
This commit is contained in:
Navid Emamdoost 2019-09-30 15:42:22 -05:00 committed by Greg Kroah-Hartman
parent 5dc54a06f6
commit e0b0cb9388
1 changed files with 2 additions and 1 deletions
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3
drivers/virt/vboxguest/vboxguest_utils.c
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@ -220,6 +220,8 @@ static int hgcm_call_preprocess_linaddr(
if (!bounce_buf) if (!bounce_buf)
return -ENOMEM; return -ENOMEM;
*bounce_buf_ret = bounce_buf;
if (copy_in) { if (copy_in) {
ret = copy_from_user(bounce_buf, (void __user *)buf, len); ret = copy_from_user(bounce_buf, (void __user *)buf, len);
if (ret) if (ret)
@ -228,7 +230,6 @@ static int hgcm_call_preprocess_linaddr(
memset(bounce_buf, 0, len); memset(bounce_buf, 0, len);
} }
*bounce_buf_ret = bounce_buf;
hgcm_call_add_pagelist_size(bounce_buf, len, extra); hgcm_call_add_pagelist_size(bounce_buf, len, extra);
return 0; return 0;
} }