diff options
| author | Jovi Zhang <bookjovi@gmail.com> | 2010-11-10 07:22:18 -0600 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2010-11-17 13:54:57 -0600 |
| commit | 5450d904054b4ed582793ad6ecb5469f03cc4c46 (patch) | |
| tree | 025a63a774f56b02e001cd49ead0c26f428cbb9b /kernel/debug | |
| parent | 85e76ab50aecbdc9011806f2f8943450ccb0d93c (diff) | |
| download | lwn-5450d904054b4ed582793ad6ecb5469f03cc4c46.tar.gz lwn-5450d904054b4ed582793ad6ecb5469f03cc4c46.zip | |
kdb: fix crash when KDB_BASE_CMD_MAX is exceeded
When the number of dyanmic kdb commands exceeds KDB_BASE_CMD_MAX, the
kernel will fault.
Signed-off-by: Jovi Zhang <bookjovi@gmail.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'kernel/debug')
| -rw-r--r-- | kernel/debug/kdb/kdb_main.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c index 3ab3feee7840..a6e729766821 100644 --- a/kernel/debug/kdb/kdb_main.c +++ b/kernel/debug/kdb/kdb_main.c @@ -82,7 +82,7 @@ static kdbtab_t kdb_base_commands[50]; #define for_each_kdbcmd(cmd, num) \ for ((cmd) = kdb_base_commands, (num) = 0; \ num < kdb_max_commands; \ - num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++, num++) + num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++) typedef struct _kdbmsg { int km_diag; /* kdb diagnostic */ @@ -646,7 +646,7 @@ static int kdb_defcmd2(const char *cmdstr, const char *argv0) } if (!s->usable) return KDB_NOTIMP; - s->command = kmalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB); + s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB); if (!s->command) { kdb_printf("Could not allocate new kdb_defcmd table for %s\n", cmdstr); @@ -2740,13 +2740,13 @@ int kdb_register_repeat(char *cmd, } if (kdb_commands) { memcpy(new, kdb_commands, - kdb_max_commands * sizeof(*new)); + (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new)); kfree(kdb_commands); } memset(new + kdb_max_commands, 0, kdb_command_extend * sizeof(*new)); kdb_commands = new; - kp = kdb_commands + kdb_max_commands; + kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX; kdb_max_commands += kdb_command_extend; } |