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Message-Id: <20220823080131.650582945@linuxfoundation.org>
Date: Tue, 23 Aug 2022 10:03:43 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Schspa Shi <schspa@...il.com>,
Cornelia Huck <cohuck@...hat.com>,
Alex Williamson <alex.williamson@...hat.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 322/365] vfio: Clear the caps->buf to NULL after free
From: Schspa Shi <schspa@...il.com>
[ Upstream commit 6641085e8d7b3f061911517f79a2a15a0a21b97b ]
On buffer resize failure, vfio_info_cap_add() will free the buffer,
report zero for the size, and return -ENOMEM. As additional
hardening, also clear the buffer pointer to prevent any chance of a
double free.
Signed-off-by: Schspa Shi <schspa@...il.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Link: https://lore.kernel.org/r/20220629022948.55608-1-schspa@gmail.com
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/vfio/vfio.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 18fc0916587e..277cd1152dd8 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1814,6 +1814,7 @@ struct vfio_info_cap_header *vfio_info_cap_add(struct vfio_info_cap *caps,
buf = krealloc(caps->buf, caps->size + size, GFP_KERNEL);
if (!buf) {
kfree(caps->buf);
+ caps->buf = NULL;
caps->size = 0;
return ERR_PTR(-ENOMEM);
}
--
2.35.1
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