From 89d2da2495f0fb61a1678e644095cd7857a5a00f Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Tue, 27 Oct 2020 10:10:01 -0500 Subject: gfs2: Free rd_bits later in gfs2_clear_rgrpd to fix use-after-free [ Upstream commit d0f17d3883f1e3f085d38572c2ea8edbd5150172 ] Function gfs2_clear_rgrpd calls kfree(rgd->rd_bits) before calling return_all_reservations, but return_all_reservations still dereferences rgd->rd_bits in __rs_deltree. Fix that by moving the call to kfree below the call to return_all_reservations. Signed-off-by: Bob Peterson Signed-off-by: Andreas Gruenbacher Signed-off-by: Sasha Levin --- fs/gfs2/rgrp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 2736e9cfc2ee..99dcbdc1ff3a 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -747,9 +747,9 @@ void gfs2_clear_rgrpd(struct gfs2_sbd *sdp) } gfs2_free_clones(rgd); + return_all_reservations(rgd); kfree(rgd->rd_bits); rgd->rd_bits = NULL; - return_all_reservations(rgd); kmem_cache_free(gfs2_rgrpd_cachep, rgd); } } -- cgit v1.2.3