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efi: libstub: only free priv.runtime_map when allocated

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commit 4b2543f7e1e6b91cfc8dd1696e3cdf01c3ac8974 upstream.

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: f80d26043a ("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>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hagar Hemdan 2024-04-23 13:59:26 +00:00 committed by Greg Kroah-Hartman
parent 6f9881cb4d
commit b8938d6f57
1 changed files with 2 additions and 2 deletions
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4
drivers/firmware/efi/libstub/fdt.c
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@ -335,8 +335,8 @@ fail_free_new_fdt:
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;
}