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efi_memory: avoid NULL dereference in efi_free_pool 

If efi_free_pool is called with argument NULL an illegal memory
access occurs.

So let's check the parameter on entry.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
xypron.glpk@gmx.de 2017-07-14 19:12:39 +02:00 committed by Alexander Graf
parent 70bfcdc6bb
commit 71275a3e98
1 changed files with 3 additions and 0 deletions
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3
lib/efi_loader/efi_memory.c
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@ -379,6 +379,9 @@ efi_status_t efi_free_pool(void *buffer)
efi_status_t r; efi_status_t r;
struct efi_pool_allocation *alloc; struct efi_pool_allocation *alloc;
if (buffer == NULL)
return EFI_INVALID_PARAMETER;
alloc = container_of(buffer, struct efi_pool_allocation, data); alloc = container_of(buffer, struct efi_pool_allocation, data);
/* Sanity check, was the supplied address returned by allocate_pool */ /* Sanity check, was the supplied address returned by allocate_pool */
assert(((uintptr_t)alloc & EFI_PAGE_MASK) == 0); assert(((uintptr_t)alloc & EFI_PAGE_MASK) == 0);