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selftests/livepatch: fix mem leaks in test-klp-shadow-vars 

In some cases, when an error occurs during testing and the main test
routine returns, a memory leak occurs via leaving previously registered
shadow variables allocated in the kernel as well as shadow_ptr list
elements. From now on, in case of error, remove all allocated shadow
variables and shadow_ptr struct elements.

Signed-off-by: Yannick Cote <ycote@redhat.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20200603182058.109470-5-ycote@redhat.com
This commit is contained in:
Yannick Cote 2020-06-03 14:20:58 -04:00 committed by Petr Mladek
parent 76efe6da89
commit 270f7806d3
1 changed files with 31 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
lib/livepatch/test_klp_shadow_vars.c
View File

@ -170,6 +170,7 @@ static int test_klp_shadow_vars_init(void)
char *pndup[NUM_OBJS];
int nfields2[NUM_OBJS], *pnfields2[NUM_OBJS], **sv2[NUM_OBJS];
void **sv;
int ret;
int i;
ptr_id(NULL);
@ -196,31 +197,39 @@ static int test_klp_shadow_vars_init(void)
sizeof(pnfields1[i]), GFP_KERNEL,
shadow_ctor, &pnfields1[i]);
}
if (!sv1[i])
return -ENOMEM;
if (!sv1[i]) {
ret = -ENOMEM;
goto out;
}
pnfields2[i] = &nfields2[i];
ptr_id(pnfields2[i]);
sv2[i] = shadow_alloc(&objs[i], SV_ID2, sizeof(pnfields2[i]),
GFP_KERNEL, shadow_ctor, &pnfields2[i]);
if (!sv2[i])
return -ENOMEM;
if (!sv2[i]) {
ret = -ENOMEM;
goto out;
}
}
/* pass 2: verify we find allocated svars and where they point to */
for (i = 0; i < NUM_OBJS; i++) {
/* check the "char" svar for all objects */
sv = shadow_get(&objs[i], SV_ID1);
if (!sv)
return -EINVAL;
if (!sv) {
ret = -EINVAL;
goto out;
}
if ((char **)sv == sv1[i] && *sv1[i] == pnfields1[i])
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv1[i]), ptr_id(*sv1[i]));
/* check the "int" svar for all objects */
sv = shadow_get(&objs[i], SV_ID2);
if (!sv)
return -EINVAL;
if (!sv) {
ret = -EINVAL;
goto out;
}
if ((int **)sv == sv2[i] && *sv2[i] == pnfields2[i])
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv2[i]), ptr_id(*sv2[i]));
@ -233,8 +242,10 @@ static int test_klp_shadow_vars_init(void)
sv = shadow_get_or_alloc(&objs[i], SV_ID1, sizeof(pndup[i]),
GFP_KERNEL, shadow_ctor, &pndup[i]);
if (!sv)
return -EINVAL;
if (!sv) {
ret = -EINVAL;
goto out;
}
if ((char **)sv == sv1[i] && *sv1[i] == pnfields1[i])
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv1[i]), ptr_id(*sv1[i]));
@ -251,8 +262,10 @@ static int test_klp_shadow_vars_init(void)
/* pass 5: check we still find <objs[*], SV_ID2> svar pairs */
for (i = 0; i < NUM_OBJS; i++) {
sv = shadow_get(&objs[i], SV_ID2); /* 'int' pairs */
if (!sv)
return -EINVAL;
if (!sv) {
ret = -EINVAL;
goto out;
}
if ((int **)sv == sv2[i] && *sv2[i] == pnfields2[i])
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv2[i]), ptr_id(*sv2[i]));
@ -269,6 +282,12 @@ static int test_klp_shadow_vars_init(void)
free_ptr_list();
return 0;
out:
shadow_free_all(SV_ID1, NULL); /* 'char' pairs */
shadow_free_all(SV_ID2, NULL); /* 'int' pairs */
free_ptr_list();
return ret;
}
static void test_klp_shadow_vars_exit(void)