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)
Is it possible for this to get into 2.6.24?
Signed-off-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
---
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 54f44e5..e19e83a 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 = sizeof(*log) * log_len < PAGE_SIZE ?
+ 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;
}
--
1.5.3.4
-
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