diff options
| author | Vitaly Mayatskikh <v.mayatskih@gmail.com> | 2010-05-11 14:06:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-11 17:33:42 -0700 |
| commit | 475f9aa6aa538befcbd0fa95bdebada600f247cd (patch) | |
| tree | 204167585e965b67a3b95b972744a96069f0169a /kernel | |
| parent | d586ebbb8814e039545d38f69029533f3f17748d (diff) | |
| download | lwn-475f9aa6aa538befcbd0fa95bdebada600f247cd.tar.gz lwn-475f9aa6aa538befcbd0fa95bdebada600f247cd.zip | |
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
0.
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: Vitaly Mayatskikh <v.mayatskih@gmail.com>
Cc: Cong Wang <amwang@redhat.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kexec.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c index 87ebe8adc474..474a84715eac 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -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) release_resource(&crashk_res); - } else - crashk_res.end = end - 1; + crashk_res.end = end - 1; unlock: mutex_unlock(&kexec_mutex); |