1/// Find uses of standard freeing functons on values allocated using devm_ 2/// functions. Values allocated using the devm_functions are freed when 3/// the device is detached, and thus the use of the standard freeing 4/// function would cause a double free. 5/// See Documentation/driver-model/devres.txt for more information. 6/// 7/// A difficulty of detecting this problem is that the standard freeing 8/// function might be called from a different function than the one 9/// containing the allocation function. It is thus necessary to make the 10/// connection between the allocation function and the freeing function. 11/// Here this is done using the specific argument text, which is prone to 12/// false positives. There is no rule for the request_region and 13/// request_mem_region variants because this heuristic seems to be a bit 14/// less reliable in these cases. 15/// 16// Confidence: Moderate 17// Copyright: (C) 2011 Julia Lawall, INRIA/LIP6. GPLv2. 18// Copyright: (C) 2011 Gilles Muller, INRIA/LiP6. GPLv2. 19// URL: http://coccinelle.lip6.fr/ 20// Comments: 21// Options: -no_includes -include_headers 22 23virtual org 24virtual report 25virtual context 26 27@r depends on context || org || report@ 28expression x; 29@@ 30 31( 32 x = devm_kzalloc(...) 33| 34 x = devm_request_irq(...) 35| 36 x = devm_ioremap(...) 37| 38 x = devm_ioremap_nocache(...) 39| 40 x = devm_ioport_map(...) 41) 42 43@pb@ 44expression r.x; 45position p; 46@@ 47 48( 49* kfree@p(x) 50| 51* free_irq@p(x) 52| 53* iounmap@p(x) 54| 55* ioport_unmap@p(x) 56) 57 58@script:python depends on org@ 59p << pb.p; 60@@ 61 62msg="WARNING: invalid free of devm_ allocated data" 63coccilib.org.print_todo(p[0], msg) 64 65@script:python depends on report@ 66p << pb.p; 67@@ 68 69msg="WARNING: invalid free of devm_ allocated data" 70coccilib.report.print_report(p[0], msg) 71 72