[PATCH v2 1/4] soc: apple: rtkit: free syslog buffer before reinitializing

[Laxman Acharya Padhya]

A second SYSLOG_INIT message overwrites syslog_msg_buffer without
freeing the previous allocation. Free the old buffer before allocating
its replacement.

Fixes: 9bd1d9a0d8bb ("soc: apple: Add RTKit IPC library")
Cc: stable at vger.kernel.org
Signed-off-by: Laxman Acharya Padhya <acharyalaxman8848 at gmail.com>
---
 drivers/soc/apple/rtkit.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c
index a3fdac8f6f06..1886f7eba77d 100644
--- a/drivers/soc/apple/rtkit.c
+++ b/drivers/soc/apple/rtkit.c
@@ -422,6 +422,9 @@ static void apple_rtkit_ioreport_rx(struct apple_rtkit *rtk, u64 msg)
 
 static void apple_rtkit_syslog_rx_init(struct apple_rtkit *rtk, u64 msg)
 {
+	kfree(rtk->syslog_msg_buffer);
+	rtk->syslog_msg_buffer = NULL;
+
 	rtk->syslog_n_entries = FIELD_GET(APPLE_RTKIT_SYSLOG_N_ENTRIES, msg);
 	rtk->syslog_msg_size = FIELD_GET(APPLE_RTKIT_SYSLOG_MSG_SIZE, msg);
 
-- 
2.51.2