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    Subject[PATCH 5.7 329/376] powerpc/fadump: Account for memory_limit while reserving memory
    Date
    From: Hari Bathini <hbathini@linux.ibm.com>

    commit 9a2921e5baca1d25eb8d21f21d1e90581a6d0f68 upstream.

    If the memory chunk found for reserving memory overshoots the memory
    limit imposed, do not proceed with reserving memory. Default behavior
    was this until commit 140777a3d8df ("powerpc/fadump: consider reserved
    ranges while reserving memory") changed it unwittingly.

    Fixes: 140777a3d8df ("powerpc/fadump: consider reserved ranges while reserving memory")
    Cc: stable@vger.kernel.org
    Reported-by: kbuild test robot <lkp@intel.com>
    Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/159057266320.22331.6571453892066907320.stgit@hbathini.in.ibm.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/powerpc/kernel/fadump.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/powerpc/kernel/fadump.c
    +++ b/arch/powerpc/kernel/fadump.c
    @@ -603,7 +603,7 @@ int __init fadump_reserve_mem(void)
    */
    base = fadump_locate_reserve_mem(base, size);

    - if (!base) {
    + if (!base || (base + size > mem_boundary)) {
    pr_err("Failed to find memory chunk for reservation!\n");
    goto error_out;
    }

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