lkml.org 
[lkml]   [2017]   [Oct]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] staging: greybus: spilib: fix use-after-free after deregistration
Date
Remove erroneous spi_master_put() after controller deregistration which
would access the already freed spi controller.

Note that spi_unregister_master() drops our only controller reference.

Fixes: ba3e67001b42 ("greybus: SPI: convert to a gpbridge driver")
Cc: stable <stable@vger.kernel.org> # 4.9
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/staging/greybus/spilib.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/greybus/spilib.c b/drivers/staging/greybus/spilib.c
index e97b19148497..1e7321a1404c 100644
--- a/drivers/staging/greybus/spilib.c
+++ b/drivers/staging/greybus/spilib.c
@@ -544,11 +544,14 @@ int gb_spilib_master_init(struct gb_connection *connection, struct device *dev,

return 0;

-exit_spi_unregister:
- spi_unregister_master(master);
exit_spi_put:
spi_master_put(master);

+ return ret;
+
+exit_spi_unregister:
+ spi_unregister_master(master);
+
return ret;
}
EXPORT_SYMBOL_GPL(gb_spilib_master_init);
@@ -558,7 +561,6 @@ void gb_spilib_master_exit(struct gb_connection *connection)
struct spi_master *master = gb_connection_get_data(connection);

spi_unregister_master(master);
- spi_master_put(master);
}
EXPORT_SYMBOL_GPL(gb_spilib_master_exit);

--
2.14.3
\
 
 \ /
  Last update: 2017-10-29 13:02    [W:0.039 / U:0.936 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site