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d81eeacd48
uclass_find_first_device() may return NULL if no device for the uclass
exists. Handle this case gracefully.
Addresses-Coverity: CID 356244 ("Null pointer dereferences (FORWARD_NULL)")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Verified Boot for Embedded (VBE) access functions
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*
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* Copyright 2022 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <bootmeth.h>
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#include <bootstd.h>
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#include <dm.h>
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#include <image.h>
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#include <vbe.h>
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#include <dm/uclass-internal.h>
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/**
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* is_vbe() - Check if a device is a VBE method
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*
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* @dev: Device to check
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* @return true if this is a VBE bootmth device, else false
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*/
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static bool is_vbe(struct udevice *dev)
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{
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return !strncmp("vbe", dev->driver->name, 3);
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}
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int vbe_find_next_device(struct udevice **devp)
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{
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for (uclass_find_next_device(devp);
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*devp;
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uclass_find_next_device(devp)) {
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if (is_vbe(*devp))
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return 0;
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}
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return 0;
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}
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int vbe_find_first_device(struct udevice **devp)
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{
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uclass_find_first_device(UCLASS_BOOTMETH, devp);
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if (!*devp || is_vbe(*devp))
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return 0;
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return vbe_find_next_device(devp);
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}
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int vbe_list(void)
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{
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struct bootstd_priv *std;
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struct udevice *dev;
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int ret;
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ret = bootstd_get_priv(&std);
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if (ret)
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return ret;
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printf("%3s %-3s %-15s %-15s %s\n", "#", "Sel", "Device", "Driver",
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"Description");
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printf("%3s %-3s %-15s %-15s %s\n", "---", "---", "--------------",
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"--------------", "-----------");
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for (ret = vbe_find_first_device(&dev); dev;
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ret = vbe_find_next_device(&dev)) {
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const struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
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printf("%3d %-3s %-15s %-15s %s\n", dev_seq(dev),
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std->vbe_bootmeth == dev ? "*" : "", dev->name,
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dev->driver->name, plat->desc);
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}
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printf("%3s %-3s %-15s %-15s %s\n", "---", "---", "--------------",
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"--------------", "-----------");
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return 0;
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}
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int vbe_select(struct udevice *dev)
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{
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struct bootstd_priv *std;
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int ret;
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ret = bootstd_get_priv(&std);
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if (ret)
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return ret;
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std->vbe_bootmeth = dev;
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return 0;
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}
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int vbe_find_by_any(const char *name, struct udevice **devp)
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{
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struct udevice *dev;
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int ret, seq;
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char *endp;
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seq = simple_strtol(name, &endp, 16);
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/* Select by name */
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if (*endp) {
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ret = uclass_get_device_by_name(UCLASS_BOOTMETH, name, &dev);
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if (ret) {
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printf("Cannot probe VBE bootmeth '%s' (err=%d)\n", name,
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ret);
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return ret;
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}
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/* select by number */
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} else {
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ret = uclass_get_device_by_seq(UCLASS_BOOTMETH, seq, &dev);
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if (ret) {
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printf("Cannot find '%s' (err=%d)\n", name, ret);
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return ret;
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}
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}
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*devp = dev;
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return 0;
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}
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