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usb: return correct errno code when krealloc fails

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In function wusb_dev_sec_add(), variable result takes the return value.
Its value should be negative on failures. When function krealloc() is
called, an earlier check of variable result guarantees that the value of
result must not be less than "sizeof(*secd)", and result is not
reassigned when krealloc() returns a NULL pointer. As a result, a
positive value may be returned, which makes it impossible for the caller
of wusb_dev_sec_add() to detect the error. This patch fixes the bug by
assigning -ENOMEM to result when krealloc() returns NULL.

Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pan Bian 2016-11-29 20:50:30 +08:00 committed by Greg Kroah-Hartman
parent fd3ed14ed0
commit fca0ca95c3
1 changed files with 1 additions and 0 deletions
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drivers/usb/wusbcore/security.c
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@ -240,6 +240,7 @@ int wusb_dev_sec_add(struct wusbhc *wusbhc,
if (new_secd == NULL) {
dev_err(dev,
"Can't allocate space for security descriptors\n");
result = -ENOMEM;
goto out;
}
secd = new_secd;