docs/news.xml | 10 ++++++++++ src/rpc/virnettlscontext.c | 6 ++++-- 2 files changed, 14 insertions(+), 2 deletions(-)
Failed new gnutls context allocations in virNetTLSContextNew function
results in double free and segfault. Occasional memory leaks may also
occur. You can read detailed description at:
https://bugzilla.redhat.com/show_bug.cgi?id=1699062
Signed-off-by: Adrian Brzezinski <redhat@adrb.pl>
---
docs/news.xml | 10 ++++++++++
src/rpc/virnettlscontext.c | 6 ++++--
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/docs/news.xml b/docs/news.xml
index 21807f2..f6157ec 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -350,6 +350,16 @@
<section title="Bug fixes">
<change>
<summary>
+ rpc: Segfaults and memory leak in virNetTLSContextNew function
+ </summary>
+ <description>
+ Failed new gnutls context allocations in virNetTLSContextNew function
+ results in double free and segfault. Occasional memory leaks may also
+ occur.
+ </description>
+ </change>
+ <change>
+ <summary>
qemu: Use CAP_DAC_OVERRIDE during QEMU capabilities probing
</summary>
<description>
diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
index 72e9ed9..8f6ec8f 100644
--- a/src/rpc/virnettlscontext.c
+++ b/src/rpc/virnettlscontext.c
@@ -703,14 +703,14 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
return NULL;
if (VIR_STRDUP(ctxt->priority, priority) < 0)
- goto error;
+ goto ctxt_init_error;
err = gnutls_certificate_allocate_credentials(&ctxt->x509cred);
if (err) {
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Unable to allocate x509 credentials: %s"),
gnutls_strerror(err));
- goto error;
+ goto ctxt_init_error;
}
if (sanityCheckCert &&
@@ -759,6 +759,8 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
if (isServer)
gnutls_dh_params_deinit(ctxt->dhParams);
gnutls_certificate_free_credentials(ctxt->x509cred);
+ ctxt_init_error:
+ if (ctxt->priority) VIR_FREE(ctxt->priority);
VIR_FREE(ctxt);
return NULL;
}
--
1.8.3.1
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Changes: - no new goto label - passing ctxt->priority directly to VIR_FREE - dedicated commit for news file Adrian Brzezinski (2): rpc: cleanup in virNetTLSContextNew news: cleanup in virNetTLSContextNew docs/news.xml | 10 ++++++++++ src/rpc/virnettlscontext.c | 10 +++++++++- 2 files changed, 19 insertions(+), 1 deletion(-) -- 1.8.3.1 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Failed new gnutls context allocations in virNetTLSContextNew function
results in double free and segfault. Occasional memory leaks may also
occur.
Signed-off-by: Adrian Brzezinski <redhat@adrb.pl>
---
src/rpc/virnettlscontext.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
index 72e9ed9..7b5d578 100644
--- a/src/rpc/virnettlscontext.c
+++ b/src/rpc/virnettlscontext.c
@@ -707,6 +707,12 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
err = gnutls_certificate_allocate_credentials(&ctxt->x509cred);
if (err) {
+ /* gnutls_certificate_credentials_t is complex structure with multiple
+ * internal memory allocatons that can go wrong, so make sure that
+ * reference is NULL.
+ */
+ ctxt->x509cred = NULL;
+
virReportError(VIR_ERR_SYSTEM_ERROR,
_("Unable to allocate x509 credentials: %s"),
gnutls_strerror(err));
@@ -758,7 +764,9 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
error:
if (isServer)
gnutls_dh_params_deinit(ctxt->dhParams);
- gnutls_certificate_free_credentials(ctxt->x509cred);
+ if (ctxt->x509cred)
+ gnutls_certificate_free_credentials(ctxt->x509cred);
+ VIR_FREE(ctxt->priority);
VIR_FREE(ctxt);
return NULL;
}
--
1.8.3.1
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On Mon, Apr 15, 2019 at 08:29:42PM +0200, Adrian Brzezinski wrote:
> Failed new gnutls context allocations in virNetTLSContextNew function
> results in double free and segfault. Occasional memory leaks may also
> occur.
>
> Signed-off-by: Adrian Brzezinski <redhat@adrb.pl>
> ---
> src/rpc/virnettlscontext.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
> index 72e9ed9..7b5d578 100644
> --- a/src/rpc/virnettlscontext.c
> +++ b/src/rpc/virnettlscontext.c
> @@ -707,6 +707,12 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
>
> err = gnutls_certificate_allocate_credentials(&ctxt->x509cred);
> if (err) {
> + /* gnutls_certificate_credentials_t is complex structure with multiple
> + * internal memory allocatons that can go wrong, so make sure that
> + * reference is NULL.
> + */
I changd this comment to
/* While gnutls_certificate_credentials_t will free any
* partially allocated credentials struct, it does not
* set the returned pointer back to NULL after it is
* freed in an error path.
*/
and then pushed the fix
Regards,
Daniel
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Signed-off-by: Adrian Brzezinski <redhat@adrb.pl>
---
docs/news.xml | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/docs/news.xml b/docs/news.xml
index 86c7734..9338381 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -51,6 +51,16 @@
</change>
</section>
<section title="Bug fixes">
+ <change>
+ <summary>
+ rpc: cleanup in virNetTLSContextNew
+ </summary>
+ <description>
+ Failed new gnutls context allocations in virNetTLSContextNew
+ function results in double free and segfault. Occasional memory
+ leaks may also occur.
+ </description>
+ </change>
</section>
</release>
<release version="v5.2.0" date="2019-04-03">
--
1.8.3.1
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On Fri, Apr 12, 2019 at 06:10:49PM +0200, Adrian Brzezinski wrote:
> Failed new gnutls context allocations in virNetTLSContextNew function
> results in double free and segfault. Occasional memory leaks may also
> occur. You can read detailed description at:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1699062
>
> Signed-off-by: Adrian Brzezinski <redhat@adrb.pl>
> ---
> docs/news.xml | 10 ++++++++++
> src/rpc/virnettlscontext.c | 6 ++++--
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/docs/news.xml b/docs/news.xml
> index 21807f2..f6157ec 100644
> --- a/docs/news.xml
> +++ b/docs/news.xml
> @@ -350,6 +350,16 @@
> <section title="Bug fixes">
> <change>
> <summary>
> + rpc: Segfaults and memory leak in virNetTLSContextNew function
> + </summary>
> + <description>
> + Failed new gnutls context allocations in virNetTLSContextNew function
> + results in double free and segfault. Occasional memory leaks may also
> + occur.
> + </description>
> + </change>
> + <change>
> + <summary>
> qemu: Use CAP_DAC_OVERRIDE during QEMU capabilities probing
> </summary>
> <description>
> diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
> index 72e9ed9..8f6ec8f 100644
> --- a/src/rpc/virnettlscontext.c
> +++ b/src/rpc/virnettlscontext.c
> @@ -703,14 +703,14 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
> return NULL;
>
> if (VIR_STRDUP(ctxt->priority, priority) < 0)
> - goto error;
> + goto ctxt_init_error;
>
> err = gnutls_certificate_allocate_credentials(&ctxt->x509cred);
> if (err) {
> virReportError(VIR_ERR_SYSTEM_ERROR,
> _("Unable to allocate x509 credentials: %s"),
> gnutls_strerror(err));
> - goto error;
> + goto ctxt_init_error;
> }
>
> if (sanityCheckCert &&
> @@ -759,6 +759,8 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
> if (isServer)
> gnutls_dh_params_deinit(ctxt->dhParams);
> gnutls_certificate_free_credentials(ctxt->x509cred);
> + ctxt_init_error:
Having multiple label targets is not an attractive pattern. The core
problem here is that gnutls_certificate_free_credentials will
unconditionally dereference the credentials struct without checking
if it is NULL. We can avoid this by just adding a check
if (ctxt->x509cred)
gnutls_certificate_free_credentials(ctxt->x509cred);
> + if (ctxt->priority) VIR_FREE(ctxt->priority);
> VIR_FREE(ctxt);
> return NULL;
> }
Regards,
Daniel
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The commit summary reads like you're introducing the segfaults;
how about:
rpc: fix cleanup in virNetTLSContextNew
On Mon, Apr 15, 2019 at 10:21:13AM +0100, Daniel P. Berrangé wrote:
>On Fri, Apr 12, 2019 at 06:10:49PM +0200, Adrian Brzezinski wrote:
>> Failed new gnutls context allocations in virNetTLSContextNew function
>> results in double free and segfault. Occasional memory leaks may also
>> occur.
>> You can read detailed description at:
This sentence is unnecessary
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=1699062
>>
>> Signed-off-by: Adrian Brzezinski <redhat@adrb.pl>
>> ---
>> docs/news.xml | 10 ++++++++++
>> src/rpc/virnettlscontext.c | 6 ++++--
>> 2 files changed, 14 insertions(+), 2 deletions(-)
>>
>> diff --git a/docs/news.xml b/docs/news.xml
>> index 21807f2..f6157ec 100644
>> --- a/docs/news.xml
>> +++ b/docs/news.xml
>> @@ -350,6 +350,16 @@
>> <section title="Bug fixes">
>> <change>
>> <summary>
>> + rpc: Segfaults and memory leak in virNetTLSContextNew function
>> + </summary>
>> + <description>
>> + Failed new gnutls context allocations in virNetTLSContextNew function
>> + results in double free and segfault. Occasional memory leaks may also
>> + occur.
>> + </description>
>> + </change>
>> + <change>
>> + <summary>
>> qemu: Use CAP_DAC_OVERRIDE during QEMU capabilities probing
>> </summary>
>> <description>
Please put the news update in a separate commit - otherwise developers
backporting the patch into downstream distros will pretty much always
have a conflict in this file.
>> diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
>> index 72e9ed9..8f6ec8f 100644
>> --- a/src/rpc/virnettlscontext.c
>> +++ b/src/rpc/virnettlscontext.c
>> @@ -703,14 +703,14 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
>> return NULL;
>>
>> if (VIR_STRDUP(ctxt->priority, priority) < 0)
>> - goto error;
>> + goto ctxt_init_error;
>>
>> err = gnutls_certificate_allocate_credentials(&ctxt->x509cred);
>> if (err) {
>> virReportError(VIR_ERR_SYSTEM_ERROR,
>> _("Unable to allocate x509 credentials: %s"),
>> gnutls_strerror(err));
>> - goto error;
>> + goto ctxt_init_error;
>> }
>>
>> if (sanityCheckCert &&
>> @@ -759,6 +759,8 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
>> if (isServer)
>> gnutls_dh_params_deinit(ctxt->dhParams);
>> gnutls_certificate_free_credentials(ctxt->x509cred);
>> + ctxt_init_error:
>
>Having multiple label targets is not an attractive pattern. The core
>problem here is that gnutls_certificate_free_credentials will
>unconditionally dereference the credentials struct without checking
>if it is NULL. We can avoid this by just adding a check
>
> if (ctxt->x509cred)
> gnutls_certificate_free_credentials(ctxt->x509cred);
>
>> + if (ctxt->priority) VIR_FREE(ctxt->priority);
I'll just add that VIR_FREE can safely be called on NULL pointers and
it sets the pointer to NULL after freeing it.
Jano
>> VIR_FREE(ctxt);
>> return NULL;
>> }
>
>Regards,
>Daniel
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On 15.04.2019 11:21, Daniel P. Berrangé wrote:
> On Fri, Apr 12, 2019 at 06:10:49PM +0200, Adrian Brzezinski wrote:
>> Failed new gnutls context allocations in virNetTLSContextNew function
>> results in double free and segfault. Occasional memory leaks may also
>> occur. You can read detailed description at:
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=1699062
>>
>> Signed-off-by: Adrian Brzezinski <redhat@adrb.pl>
>> ---
>> docs/news.xml | 10 ++++++++++
>> src/rpc/virnettlscontext.c | 6 ++++--
>> 2 files changed, 14 insertions(+), 2 deletions(-)
>>
>> diff --git a/docs/news.xml b/docs/news.xml
>> index 21807f2..f6157ec 100644
>> --- a/docs/news.xml
>> +++ b/docs/news.xml
>> @@ -350,6 +350,16 @@
>> <section title="Bug fixes">
>> <change>
>> <summary>
>> + rpc: Segfaults and memory leak in virNetTLSContextNew function
>> + </summary>
>> + <description>
>> + Failed new gnutls context allocations in virNetTLSContextNew function
>> + results in double free and segfault. Occasional memory leaks may also
>> + occur.
>> + </description>
>> + </change>
>> + <change>
>> + <summary>
>> qemu: Use CAP_DAC_OVERRIDE during QEMU capabilities probing
>> </summary>
>> <description>
>> diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
>> index 72e9ed9..8f6ec8f 100644
>> --- a/src/rpc/virnettlscontext.c
>> +++ b/src/rpc/virnettlscontext.c
>> @@ -703,14 +703,14 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
>> return NULL;
>>
>> if (VIR_STRDUP(ctxt->priority, priority) < 0)
>> - goto error;
>> + goto ctxt_init_error;
>>
>> err = gnutls_certificate_allocate_credentials(&ctxt->x509cred);
>> if (err) {
>> virReportError(VIR_ERR_SYSTEM_ERROR,
>> _("Unable to allocate x509 credentials: %s"),
>> gnutls_strerror(err));
>> - goto error;
>> + goto ctxt_init_error;
>> }
>>
>> if (sanityCheckCert &&
>> @@ -759,6 +759,8 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
>> if (isServer)
>> gnutls_dh_params_deinit(ctxt->dhParams);
>> gnutls_certificate_free_credentials(ctxt->x509cred);
>> + ctxt_init_error:
>
> Having multiple label targets is not an attractive pattern. The core
> problem here is that gnutls_certificate_free_credentials will
> unconditionally dereference the credentials struct without checking
> if it is NULL. We can avoid this by just adding a check
>
> if (ctxt->x509cred)
> gnutls_certificate_free_credentials(ctxt->x509cred);
Please read gdb session from bugzilla.
What really failed is tlist allocation in
gnutls_certificate_allocate_credentials, so ctxt->x509cred isn't NULL.
But I got your point.
>> + if (ctxt->priority) VIR_FREE(ctxt->priority);
>> VIR_FREE(ctxt);
>> return NULL;
>> }
>
> Regards,
> Daniel
>
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