priv.runtime_map is only allocated when efi_novamap is not set. Otherwise, it is an uninitialized value. In the error path, it is freed unconditionally. Avoid passing an uninitialized value to free_pool. Free priv.runtime_map only when it was allocated.
This bug was discovered and resolved using Coverity Static Analysis Security Testing (SAST) by Synopsys, Inc.
Fixes: f80d26043af9 ("efi: libstub: avoid efi_get_memory_map() for allocating the virt map") Cc: stable@vger.kernel.org Signed-off-by: Hagar Hemdan hagarhem@amazon.com --- v2: added Cc stable tag to the commit message as requested by kernel test robot. --- drivers/firmware/efi/libstub/fdt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c index 70e9789ff9de..6a337f1f8787 100644 --- a/drivers/firmware/efi/libstub/fdt.c +++ b/drivers/firmware/efi/libstub/fdt.c @@ -335,8 +335,8 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
fail: efi_free(fdt_size, fdt_addr); - - efi_bs_call(free_pool, priv.runtime_map); + if (!efi_novamap) + efi_bs_call(free_pool, priv.runtime_map);
return EFI_LOAD_ERROR; }