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gfs2: Fix error path kobject memory leak

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If a call to kobject_init_and_add() fails we must call kobject_put()
otherwise we leak memory.

Function gfs2_sys_fs_add always calls kobject_init_and_add() which
always calls kobject_init().

It is safe to leave object destruction up to the kobject release
function and never free it manually.

Remove call to kfree() and always call kobject_put() in the error path.

Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tobin C. Harding 2019-05-13 21:59:04 +02:00 committed by Linus Torvalds
parent 3aff5fac54
commit fbcde197e1
1 changed files with 1 additions and 7 deletions
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8
fs/gfs2/sys.c
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@ -650,7 +650,6 @@ int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
char ro[20];
char spectator[20];
char *envp[] = { ro, spectator, NULL };
int sysfs_frees_sdp = 0;
sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
@ -661,8 +660,6 @@ int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
if (error)
goto fail_reg;
sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
function gfs2_sbd_release. */
error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
if (error)
goto fail_reg;
@ -687,10 +684,7 @@ int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
fail_reg:
free_percpu(sdp->sd_lkstats);
fs_err(sdp, "error %d adding sysfs files\n", error);
if (sysfs_frees_sdp)
kobject_put(&sdp->sd_kobj);
else
kfree(sdp);
kobject_put(&sdp->sd_kobj);
sb->s_fs_info = NULL;
return error;
}