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| author | Yannick Cote <ycote@redhat.com> | 2020-06-03 14:20:58 -0400 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2020-06-08 10:55:10 +0200 |
| commit | 270f7806d3b91b9c71fa8fe66f7dcc2d6587694e (patch) | |
| tree | be5f0b12f79c3e150833c3bb3c8f8d409b09ef0d | |
| parent | 76efe6da89d8320e9ba65cebe0b3bcb6e5c29b31 (diff) | |
| download | linux-270f7806d3b91b9c71fa8fe66f7dcc2d6587694e.tar.gz linux-270f7806d3b91b9c71fa8fe66f7dcc2d6587694e.tar.bz2 linux-270f7806d3b91b9c71fa8fe66f7dcc2d6587694e.zip | |
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
| -rw-r--r-- | lib/livepatch/test_klp_shadow_vars.c | 43 |
1 files changed, 31 insertions, 12 deletions
diff --git a/lib/livepatch/test_klp_shadow_vars.c b/lib/livepatch/test_klp_shadow_vars.c index a49265e56917..b99116490858 100644 --- a/lib/livepatch/test_klp_shadow_vars.c +++ b/lib/livepatch/test_klp_shadow_vars.c @@ -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) |