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authorPetr Mladek <pmladek@suse.com>2020-01-16 16:31:42 +0100
committerJiri Kosina <jkosina@suse.cz>2020-01-17 11:12:06 +0100
commit8f6b88662cacb1d01398c1e8be52aeac433189f6 (patch)
tree29ed4a7bbc4cbff644df8f5cf54400956ccb09c9 /samples
parentMerge tag 'livepatching-for-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching (diff)
downloadwireguard-linux-8f6b88662cacb1d01398c1e8be52aeac433189f6.tar.xz
wireguard-linux-8f6b88662cacb1d01398c1e8be52aeac433189f6.zip
livepatch/sample: Use the right type for the leaking data pointer
The "leak" pointer, in the sample of shadow variable API, is allocated as sizeof(int). Let's help developers and static analyzers with understanding the code by using the appropriate pointer type. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Reviewed-by: Joe Lawrence <joe.lawrence@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'samples')
-rw-r--r--samples/livepatch/livepatch-shadow-fix1.c12
-rw-r--r--samples/livepatch/livepatch-shadow-fix2.c4
-rw-r--r--samples/livepatch/livepatch-shadow-mod.c4
3 files changed, 10 insertions, 10 deletions
diff --git a/samples/livepatch/livepatch-shadow-fix1.c b/samples/livepatch/livepatch-shadow-fix1.c
index e89ca4546114..bab12bdb753f 100644
--- a/samples/livepatch/livepatch-shadow-fix1.c
+++ b/samples/livepatch/livepatch-shadow-fix1.c
@@ -52,8 +52,8 @@ struct dummy {
*/
static int shadow_leak_ctor(void *obj, void *shadow_data, void *ctor_data)
{
- void **shadow_leak = shadow_data;
- void *leak = ctor_data;
+ int **shadow_leak = shadow_data;
+ int *leak = ctor_data;
*shadow_leak = leak;
return 0;
@@ -62,7 +62,7 @@ static int shadow_leak_ctor(void *obj, void *shadow_data, void *ctor_data)
static struct dummy *livepatch_fix1_dummy_alloc(void)
{
struct dummy *d;
- void *leak;
+ int *leak;
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d)
@@ -76,7 +76,7 @@ static struct dummy *livepatch_fix1_dummy_alloc(void)
* variable. A patched dummy_free routine can later fetch this
* pointer to handle resource release.
*/
- leak = kzalloc(sizeof(int), GFP_KERNEL);
+ leak = kzalloc(sizeof(*leak), GFP_KERNEL);
if (!leak) {
kfree(d);
return NULL;
@@ -94,7 +94,7 @@ static struct dummy *livepatch_fix1_dummy_alloc(void)
static void livepatch_fix1_dummy_leak_dtor(void *obj, void *shadow_data)
{
void *d = obj;
- void **shadow_leak = shadow_data;
+ int **shadow_leak = shadow_data;
kfree(*shadow_leak);
pr_info("%s: dummy @ %p, prevented leak @ %p\n",
@@ -103,7 +103,7 @@ static void livepatch_fix1_dummy_leak_dtor(void *obj, void *shadow_data)
static void livepatch_fix1_dummy_free(struct dummy *d)
{
- void **shadow_leak;
+ int **shadow_leak;
/*
* Patch: fetch the saved SV_LEAK shadow variable, detach and
diff --git a/samples/livepatch/livepatch-shadow-fix2.c b/samples/livepatch/livepatch-shadow-fix2.c
index 50d223b82e8b..29fe5cd42047 100644
--- a/samples/livepatch/livepatch-shadow-fix2.c
+++ b/samples/livepatch/livepatch-shadow-fix2.c
@@ -59,7 +59,7 @@ static bool livepatch_fix2_dummy_check(struct dummy *d, unsigned long jiffies)
static void livepatch_fix2_dummy_leak_dtor(void *obj, void *shadow_data)
{
void *d = obj;
- void **shadow_leak = shadow_data;
+ int **shadow_leak = shadow_data;
kfree(*shadow_leak);
pr_info("%s: dummy @ %p, prevented leak @ %p\n",
@@ -68,7 +68,7 @@ static void livepatch_fix2_dummy_leak_dtor(void *obj, void *shadow_data)
static void livepatch_fix2_dummy_free(struct dummy *d)
{
- void **shadow_leak;
+ int **shadow_leak;
int *shadow_count;
/* Patch: copy the memory leak patch from the fix1 module. */
diff --git a/samples/livepatch/livepatch-shadow-mod.c b/samples/livepatch/livepatch-shadow-mod.c
index ecfe83a943a7..7e753b0d2fa6 100644
--- a/samples/livepatch/livepatch-shadow-mod.c
+++ b/samples/livepatch/livepatch-shadow-mod.c
@@ -95,7 +95,7 @@ struct dummy {
static __used noinline struct dummy *dummy_alloc(void)
{
struct dummy *d;
- void *leak;
+ int *leak;
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d)
@@ -105,7 +105,7 @@ static __used noinline struct dummy *dummy_alloc(void)
msecs_to_jiffies(1000 * EXPIRE_PERIOD);
/* Oops, forgot to save leak! */
- leak = kzalloc(sizeof(int), GFP_KERNEL);
+ leak = kzalloc(sizeof(*leak), GFP_KERNEL);
if (!leak) {
kfree(d);
return NULL;