From 5e796671e6b8d5de4b0b423dce1b3eba144a92c9 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Thu, 22 Jul 2021 09:27:56 +0200
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Subject: [PATCH] usbredir: fix free call
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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data might point into the middle of a larger buffer, there is a separate
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free_on_destroy pointer passed into bufp_alloc() to handle that. It is
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only used in the normal workflow though, not when dropping packets due
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to the queue being full. Fix that.
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Resolves: https://gitlab.com/qemu-project/qemu/-/issues/491
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-Id: <20210722072756.647673-1-kraxel@redhat.com>
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CVE: CVE-2021-3682
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Upstream-Status: Backport [5e796671e6b8d5de4b0b423dce1b3eba144a92c9]
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Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
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---
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hw/usb/redirect.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
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index 4ec9326e05..1ec909a63a 100644
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--- a/hw/usb/redirect.c
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+++ b/hw/usb/redirect.c
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@@ -476,7 +476,7 @@ static int bufp_alloc(USBRedirDevice *dev, uint8_t *data, uint16_t len,
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if (dev->endpoint[EP2I(ep)].bufpq_dropping_packets) {
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if (dev->endpoint[EP2I(ep)].bufpq_size >
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dev->endpoint[EP2I(ep)].bufpq_target_size) {
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- free(data);
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+ free(free_on_destroy);
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return -1;
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}
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dev->endpoint[EP2I(ep)].bufpq_dropping_packets = 0;
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--
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2.25.1
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