From: Atul Gopinathan atulgopinathan@gmail.com
commit d03d1021da6fe7f46efe9f2a7335564e7c9db5ab upstream.
The fields, "toc" and "cd_info", of "struct gdrom_unit gd" are allocated in "probe_gdrom()". Prevent a memory leak by making sure "gd.cd_info" is deallocated in the "remove_gdrom()" function.
Also prevent double free of the field "gd.toc" by moving it from the module's exit function to "remove_gdrom()". This is because, in "probe_gdrom()", the function makes sure to deallocate "gd.toc" in case of any errors, so the exit function invoked later would again free "gd.toc".
The patch also maintains consistency by deallocating the above mentioned fields in "remove_gdrom()" along with another memory allocated field "gd.disk".
Suggested-by: Jens Axboe axboe@kernel.dk Cc: Peter Rosin peda@axentia.se Cc: stable stable@vger.kernel.org Signed-off-by: Atul Gopinathan atulgopinathan@gmail.com Link: https://lore.kernel.org/r/20210503115736.2104747-28-gregkh@linuxfoundation.o... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cdrom/gdrom.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/cdrom/gdrom.c +++ b/drivers/cdrom/gdrom.c @@ -850,6 +850,8 @@ static int remove_gdrom(struct platform_ if (gdrom_major) unregister_blkdev(gdrom_major, GDROM_DEV_NAME); unregister_cdrom(gd.cd_info); + kfree(gd.cd_info); + kfree(gd.toc);
return 0; } @@ -881,7 +883,6 @@ static void __exit exit_gdrom(void) { platform_device_unregister(pd); platform_driver_unregister(&gdrom_driver); - kfree(gd.toc); }
module_init(init_gdrom);