| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /// NULL check before some freeing functions is not needed. |
| 3 | /// |
| 4 | /// Based on checkpatch warning |
| 5 | /// "kfree(NULL) is safe this check is probably not required" |
| 6 | /// and kfreeaddr.cocci by Julia Lawall. |
| 7 | /// |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 8 | // Copyright: (C) 2014 Fabian Frederick. |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 9 | // Comments: - |
| 10 | // Options: --no-includes --include-headers |
| 11 | |
| 12 | virtual patch |
| 13 | virtual org |
| 14 | virtual report |
| 15 | virtual context |
| 16 | |
| 17 | @r2 depends on patch@ |
| 18 | expression E; |
| 19 | @@ |
| 20 | - if (E != NULL) |
| 21 | ( |
| 22 | kfree(E); |
| 23 | | |
| 24 | kzfree(E); |
| 25 | | |
| 26 | debugfs_remove(E); |
| 27 | | |
| 28 | debugfs_remove_recursive(E); |
| 29 | | |
| 30 | usb_free_urb(E); |
| 31 | | |
| 32 | kmem_cache_destroy(E); |
| 33 | | |
| 34 | mempool_destroy(E); |
| 35 | | |
| 36 | dma_pool_destroy(E); |
| 37 | ) |
| 38 | |
| 39 | @r depends on context || report || org @ |
| 40 | expression E; |
| 41 | position p; |
| 42 | @@ |
| 43 | |
| 44 | * if (E != NULL) |
| 45 | * \(kfree@p\|kzfree@p\|debugfs_remove@p\|debugfs_remove_recursive@p\| |
| 46 | * usb_free_urb@p\|kmem_cache_destroy@p\|mempool_destroy@p\| |
| 47 | * dma_pool_destroy@p\)(E); |
| 48 | |
| 49 | @script:python depends on org@ |
| 50 | p << r.p; |
| 51 | @@ |
| 52 | |
| 53 | cocci.print_main("NULL check before that freeing function is not needed", p) |
| 54 | |
| 55 | @script:python depends on report@ |
| 56 | p << r.p; |
| 57 | @@ |
| 58 | |
| 59 | msg = "WARNING: NULL check before some freeing functions is not needed." |
| 60 | coccilib.report.print_report(p[0], msg) |