Commit 475f9aa6 authored by Vitaly Mayatskikh's avatar Vitaly Mayatskikh Committed by Linus Torvalds
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kexec: fix OOPS in crash_kernel_shrink

Two "echo 0 > /sys/kernel/kexec_crash_size" OOPSes kernel.  Also content
of this file is invalid after first shrink to zero: it shows 1 instead of

This scenario is unlikely to happen often (root privs, valid crashkernel=
in cmdline, dump-capture kernel not loaded), I hit it only by chance.

This patch fixes it.
Signed-off-by: default avatarVitaly Mayatskikh <>
Cc: Cong Wang <>
Cc: Neil Horman <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent d586ebbb
......@@ -1134,11 +1134,9 @@ int crash_shrink_memory(unsigned long new_size)
free_reserved_phys_range(end, crashk_res.end);
if (start == end) {
crashk_res.end = end;
if (start == end)
} else
crashk_res.end = end - 1;
crashk_res.end = end - 1;
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