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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-05-06 15:50:18 +0300 |
|---|---|---|
| committer | Daniel Thompson <daniel.thompson@linaro.org> | 2019-05-12 09:50:44 +0100 |
| commit | b586627e10f57ee3aa8f0cfab0d6f7dc4ae63760 (patch) | |
| tree | 179466e3716826e61ead28ece56e385e4b99b2b7 /kernel/debug | |
| parent | ecebc5ce59a003163eb608ace38a01d7ffeb0a95 (diff) | |
| download | linux-b586627e10f57ee3aa8f0cfab0d6f7dc4ae63760.tar.bz2 | |
kdb: do a sanity check on the cpu in kdb_per_cpu()
The "whichcpu" comes from argv[3]. The cpu_online() macro looks up the
cpu in a bitmap of online cpus, but if the value is too high then it
could read beyond the end of the bitmap and possibly Oops.
Fixes: 5d5314d6795f ("kdb: core for kgdb back end (1 of 2)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Diffstat (limited to 'kernel/debug')
| -rw-r--r-- | kernel/debug/kdb/kdb_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c index fc96dbf8d9de..9ecfa37c7fbf 100644 --- a/kernel/debug/kdb/kdb_main.c +++ b/kernel/debug/kdb/kdb_main.c @@ -2583,7 +2583,7 @@ static int kdb_per_cpu(int argc, const char **argv) diag = kdbgetularg(argv[3], &whichcpu); if (diag) return diag; - if (!cpu_online(whichcpu)) { + if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) { kdb_printf("cpu %ld is not online\n", whichcpu); return KDB_BADCPUNUM; } |