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| author | Ben Hutchings <ben@decadent.org.uk> | 2023-06-02 20:28:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-14 11:15:22 +0200 |
| commit | d4925800a49c07a05fec99c0523163e7bebc5463 (patch) | |
| tree | dc0406b11e318890b5181aece07b8bcc93998a04 /lib | |
| parent | c5a17f3247bd7f6c2e22678dbfcd73832f487e3f (diff) | |
| download | linux-d4925800a49c07a05fec99c0523163e7bebc5463.tar.gz | |
lib: cpu_rmap: Fix potential use-after-free in irq_cpu_rmap_release()
[ Upstream commit 7c5d4801ecf0564c860033d89726b99723c55146 ]
irq_cpu_rmap_release() calls cpu_rmap_put(), which may free the rmap.
So we need to clear the pointer to our glue structure in rmap before
doing that, not after.
Fixes: 4e0473f1060a ("lib: cpu_rmap: Avoid use after free on rmap->obj array entries")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/ZHo0vwquhOy3FaXc@decadent.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/cpu_rmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/cpu_rmap.c b/lib/cpu_rmap.c index e77f12bb3c77..1833ad73de6f 100644 --- a/lib/cpu_rmap.c +++ b/lib/cpu_rmap.c @@ -268,8 +268,8 @@ static void irq_cpu_rmap_release(struct kref *ref) struct irq_glue *glue = container_of(ref, struct irq_glue, notify.kref); - cpu_rmap_put(glue->rmap); glue->rmap->obj[glue->index] = NULL; + cpu_rmap_put(glue->rmap); kfree(glue); } |