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From 77b0485ba92fe5f0520321385af8a7581c286df1 Mon Sep 17 00:00:00 2001
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Message-Id: <77b0485ba92fe5f0520321385af8a7581c286df1@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Mon, 31 Oct 2022 15:38:13 +0100
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Subject: [PATCH] qemu_namespace: Don't leak memory in
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qemuDomainGetPreservedMounts()
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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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The aim of qemuDomainGetPreservedMounts() is to get a list of
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filesystems mounted under /dev and optionally generate a path for
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each one where they are moved temporarily when building the
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namespace. And the function tries to be a bit clever about it.
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For instance, if /dev/shm mount point exists, there's no need to
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consider /dev/shm/a nor /dev/shm/b as preserving just 'top level'
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/dev/shm gives the same result. To achieve this, the function
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iterates over the list of filesystem as returned by
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virFileGetMountSubtree() and removes the nested ones. However, it
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does so in a bit clumsy way: plain VIR_DELETE_ELEMENT() is used
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without freeing the string itself. Therefore, if all three
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aforementioned example paths appeared on the list, /dev/shm/a and
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/dev/shm/b strings would be leaked.
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And when I think about it more, there's no real need to shrink
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the array down (realloc()). It's going to be free()-d when
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returning from the function. Switch to
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VIR_DELETE_ELEMENT_INPLACE() then.
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Fixes: cdd9205dfffa3aaed935446a41f0d2dd1357c268
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Peter Krempa <pkrempa@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit bca7a53333ead7c1afd178728de74c2977cd4b5e)
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2166573
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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---
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src/qemu/qemu_namespace.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/qemu/qemu_namespace.c b/src/qemu/qemu_namespace.c
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index 74ffd6fb90..2f50087c1d 100644
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--- a/src/qemu/qemu_namespace.c
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+++ b/src/qemu/qemu_namespace.c
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@@ -160,7 +160,8 @@ qemuDomainGetPreservedMounts(virQEMUDriverConfig *cfg,
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if (c && (*c == '/' || *c == '\0')) {
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VIR_DEBUG("Dropping path %s because of %s", mounts[j], mounts[i]);
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- VIR_DELETE_ELEMENT(mounts, j, nmounts);
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+ VIR_FREE(mounts[j]);
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+ VIR_DELETE_ELEMENT_INPLACE(mounts, j, nmounts);
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} else {
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j++;
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}
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--
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2.39.1
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