diff options
Diffstat (limited to 'scripts/coccinelle/free/ifnullfree.cocci')
| -rw-r--r-- | scripts/coccinelle/free/ifnullfree.cocci | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/scripts/coccinelle/free/ifnullfree.cocci b/scripts/coccinelle/free/ifnullfree.cocci new file mode 100644 index 000000000..a70e123cb --- /dev/null +++ b/scripts/coccinelle/free/ifnullfree.cocci @@ -0,0 +1,59 @@ +/// NULL check before some freeing functions is not needed. +/// +/// Based on checkpatch warning +/// "kfree(NULL) is safe this check is probably not required" +/// and kfreeaddr.cocci by Julia Lawall. +/// +// Copyright: (C) 2014 Fabian Frederick. GPLv2. +// Comments: - +// Options: --no-includes --include-headers + +virtual patch +virtual org +virtual report +virtual context + +@r2 depends on patch@ +expression E; +@@ +- if (E != NULL) +( + kfree(E); +| + kzfree(E); +| + debugfs_remove(E); +| + debugfs_remove_recursive(E); +| + usb_free_urb(E); +| + kmem_cache_destroy(E); +| + mempool_destroy(E); +| + dma_pool_destroy(E); +) + +@r depends on context || report || org @ +expression E; +position p; +@@ + +* if (E != NULL) +* \(kfree@p\|kzfree@p\|debugfs_remove@p\|debugfs_remove_recursive@p\| +* usb_free_urb@p\|kmem_cache_destroy@p\|mempool_destroy@p\| +* dma_pool_destroy@p\)(E); + +@script:python depends on org@ +p << r.p; +@@ + +cocci.print_main("NULL check before that freeing function is not needed", p) + +@script:python depends on report@ +p << r.p; +@@ + +msg = "WARNING: NULL check before some freeing functions is not needed." +coccilib.report.print_report(p[0], msg) |