diff options
| author | Reinette Chatre <reinette.chatre@intel.com> | 2007-12-18 22:01:02 -0800 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2007-12-19 21:31:01 -0500 |
| commit | 412e9e7800360ec93b6ba319b30666f6bfc721bd (patch) | |
| tree | 03f8c45a68c123f8a290c567f07f12d500472ea5 | |
| parent | b24d22b1d12c436a86282347868785207cff8a88 (diff) | |
ipw2200: prevent alloc of unspecified size on stack
if log_len is larger than 4K then we are killing the stack.
allocate on heap instead and limit size to what practically can
be used (PAGE_SIZE)
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | drivers/net/wireless/ipw2200.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c index 54f44e5473c..38ce8ee8d6f 100644 --- a/drivers/net/wireless/ipw2200.c +++ b/drivers/net/wireless/ipw2200.c @@ -1233,9 +1233,19 @@ static ssize_t show_event_log(struct device *d, { struct ipw_priv *priv = dev_get_drvdata(d); u32 log_len = ipw_get_event_log_len(priv); - struct ipw_event log[log_len]; + u32 log_size; + struct ipw_event *log; u32 len = 0, i; + /* not using min() because of its strict type checking */ + log_size = PAGE_SIZE / sizeof(*log) > log_len ? + sizeof(*log) * log_len : PAGE_SIZE; + log = kzalloc(log_size, GFP_KERNEL); + if (!log) { + IPW_ERROR("Unable to allocate memory for log\n"); + return 0; + } + log_len = log_size / sizeof(*log); ipw_capture_event_log(priv, log_len, log); len += snprintf(buf + len, PAGE_SIZE - len, "%08X", log_len); @@ -1244,6 +1254,7 @@ static ssize_t show_event_log(struct device *d, "\n%08X%08X%08X", log[i].time, log[i].event, log[i].data); len += snprintf(buf + len, PAGE_SIZE - len, "\n"); + kfree(log); return len; } |