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4.4.0-1128-aws
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coccinelle
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free
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ifnullfree.cocci
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/// 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); | 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) * \(kfree@p\|debugfs_remove@p\|debugfs_remove_recursive@p\| * usb_free_urb@p\|kmem_cache_destroy@p\|mempool_destroy@p\| * dma_pool_destroy@p\)(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 freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values." coccilib.report.print_report(p[0], msg)