powerpc/fadump: Account for memory_limit while reserving memory

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

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 63aac8b5f23326245c96dac57f9bd2a953f06e92..78ab9a6ee6acccfecbc0cd1897634840cdcb630b 100644 (file)
--- 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;
                }