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efi_loader: check length in CreateDeviceNode()

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When creating a device path node ensure that the size of the allocated
memory at lest matches the size of the node header.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-04-23 00:51:01 +02:00
parent f12bcc9149
commit 7d1e4b73e3
1 changed files with 3 additions and 0 deletions
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3
lib/efi_loader/efi_device_path.c
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@ -335,6 +335,9 @@ struct efi_device_path *efi_dp_create_device_node(const u8 type,
{ {
struct efi_device_path *ret; struct efi_device_path *ret;
if (length < sizeof(struct efi_device_path))
return NULL;
ret = dp_alloc(length); ret = dp_alloc(length);
if (!ret) if (!ret)
return ret; return ret;