[PATCH 5.4 223/261] powerpc/fadump: Account for memory_limit while reserving memory

[Greg Kroah-Hartman]

From: Hari Bathini <hbathini@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx
Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/159057266320.22331.6571453892066907320.stgit@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 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
@@ -601,7 +601,7 @@ 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;
 		}