diff options
| author | John Blackwood <john.blackwood@ccur.com> | 2012-12-10 22:37:22 +0100 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2013-03-02 15:52:16 +0100 |
| commit | f7c82d5a3c537a4b4d9d0395db4606bf4d3c7a5f (patch) | |
| tree | 611d31e816535a32aad7f4ad541df62a8aae24d7 | |
| parent | Linux 3.8 (diff) | |
| download | linux-f7c82d5a3c537a4b4d9d0395db4606bf4d3c7a5f.tar.xz linux-f7c82d5a3c537a4b4d9d0395db4606bf4d3c7a5f.zip | |
kdb: A fix for kdb command table expansion
When locally adding in some additional kdb commands, I stumbled
across an issue with the dynamic expansion of the kdb command table.
When the number of kdb commands exceeds the size of the statically
allocated kdb_base_commands[] array, additional space is allocated in
the kdb_register_repeat() routine.
The unused portion of the newly allocated array was not being initialized
to zero properly and this would result in segfaults when help '?' was
executed or when a search for a non-existing command would traverse the
command table beyond the end of valid command entries and then attempt
to use the non-zeroed area as actual command entries.
Signed-off-by: John Blackwood <john.blackwood@ccur.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
| -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 8875254120b6..a52493a66cf2 100644 --- a/kernel/debug/kdb/kdb_main.c +++ b/kernel/debug/kdb/kdb_main.c @@ -2739,7 +2739,7 @@ int kdb_register_repeat(char *cmd, (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new)); kfree(kdb_commands); } - memset(new + kdb_max_commands, 0, + memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0, kdb_command_extend * sizeof(*new)); kdb_commands = new; kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX; |