File usbredir-fix-free-call.patch of Package qemu.20747

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File usbredir-fix-free-call.patch of Package qemu.20747

From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 22 Jul 2021 09:27:56 +0200
Subject: usbredir: fix free call
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Git-commit: 5e796671e6b8d5de4b0b423dce1b3eba144a92c9
References: bsc#1189145 CVE-2021-3682

data might point into the middle of a larger buffer, there is a separate
free_on_destroy pointer passed into bufp_alloc() to handle that.  It is
only used in the normal workflow though, not when dropping packets due
to the queue being full.  Fix that.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/491
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210722072756.647673-1-kraxel@redhat.com>
Signed-off-by: Jose R Ziviani <jose.ziviani@suse.com>
---
 hw/usb/redirect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
index 03c858a8c153c1d81bdce4d631fb..2fe0b76a4a0e8c55aee7de40526b 100644
--- a/hw/usb/redirect.c
+++ b/hw/usb/redirect.c
@@ -475,7 +475,7 @@ static int bufp_alloc(USBRedirDevice *dev, uint8_t *data, uint16_t len,
     if (dev->endpoint[EP2I(ep)].bufpq_dropping_packets) {
         if (dev->endpoint[EP2I(ep)].bufpq_size >
                 dev->endpoint[EP2I(ep)].bufpq_target_size) {
-            free(data);
+            free(free_on_destroy);
             return -1;
         }
         dev->endpoint[EP2I(ep)].bufpq_dropping_packets = 0;

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File usbredir-fix-free-call.patch of Package qemu.20747

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