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| author | Atul Gopinathan <atulgopinathan@gmail.com> | 2021-05-03 13:56:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-26 12:06:55 +0200 |
| commit | 9285808072d4aeabdf710187acae5e09e71157e4 (patch) | |
| tree | d13bfbf6004e97e86fb9457dd05cbcd119600e28 | |
| parent | 3d2a4fb91122e1a728ef9af16af6c37dbd36c997 (diff) | |
| download | linux-stable-9285808072d4aeabdf710187acae5e09e71157e4.tar.gz linux-stable-9285808072d4aeabdf710187acae5e09e71157e4.tar.bz2 linux-stable-9285808072d4aeabdf710187acae5e09e71157e4.zip | |
cdrom: gdrom: deallocate struct gdrom_unit fields in remove_gdrom
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.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/cdrom/gdrom.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c index 466fc3eee8bb..8284705213bf 100644 --- a/drivers/cdrom/gdrom.c +++ b/drivers/cdrom/gdrom.c @@ -831,6 +831,8 @@ static int remove_gdrom(struct platform_device *devptr) if (gdrom_major) unregister_blkdev(gdrom_major, GDROM_DEV_NAME); unregister_cdrom(gd.cd_info); + kfree(gd.cd_info); + kfree(gd.toc); return 0; } @@ -862,7 +864,6 @@ static void __exit exit_gdrom(void) { platform_device_unregister(pd); platform_driver_unregister(&gdrom_driver); - kfree(gd.toc); } module_init(init_gdrom); |