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| author | Tom Rix <trix@redhat.com> | 2022-03-19 18:51:43 -0700 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2022-03-23 13:51:11 +0100 |
| commit | 5e6ded2e7a5d9c71186acc8f51989ef6e6addda4 (patch) | |
| tree | b676e714e34b2b6d19084532e2808a450f95759a /samples/livepatch/livepatch-shadow-fix2.c | |
| parent | 4327b9eaf8a4ddd2c534e4f4ed7c949cf3d2be1e (diff) | |
| download | lwn-5e6ded2e7a5d9c71186acc8f51989ef6e6addda4.tar.gz lwn-5e6ded2e7a5d9c71186acc8f51989ef6e6addda4.zip | |
livepatch: Reorder to use before freeing a pointer
Clang static analysis reports this issue
livepatch-shadow-fix1.c:113:2: warning: Use of
memory after it is freed
pr_info("%s: dummy @ %p, prevented leak @ %p\n",
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The pointer is freed in the previous statement.
Reorder the pr_info to report before the free.
Similar issue in livepatch-shadow-fix2.c
Note that it is a false positive. pr_info() just prints the address.
The freed memory is not accessed. Well, the static analyzer could not
know this easily.
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: David Vernet <void@manifault.com>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
[pmladek@suse.com: Note about that it was false positive.]
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220320015143.2208591-1-trix@redhat.com
Diffstat (limited to 'samples/livepatch/livepatch-shadow-fix2.c')
| -rw-r--r-- | samples/livepatch/livepatch-shadow-fix2.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/livepatch/livepatch-shadow-fix2.c b/samples/livepatch/livepatch-shadow-fix2.c index 29fe5cd42047..361046a4f10c 100644 --- a/samples/livepatch/livepatch-shadow-fix2.c +++ b/samples/livepatch/livepatch-shadow-fix2.c @@ -61,9 +61,9 @@ static void livepatch_fix2_dummy_leak_dtor(void *obj, void *shadow_data) void *d = obj; int **shadow_leak = shadow_data; - kfree(*shadow_leak); pr_info("%s: dummy @ %p, prevented leak @ %p\n", __func__, d, *shadow_leak); + kfree(*shadow_leak); } static void livepatch_fix2_dummy_free(struct dummy *d) |