From: Julia Lawall <julia@xxxxxxx> Error handling code following a kzalloc should free the allocated data. Error handling code following an ioremap should iounmap the allocated data. The semantic match that finds the first problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @r exists@ local idexpression x; statement S; expression E; identifier f,f1,l; position p1,p2; expression *ptr != NULL; @@ x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...); ... if (x == NULL) S <... when != x when != if (...) { <+...x...+> } ( x->f1 = E | (x->f1 == NULL || ...) | f(...,x->f1,...) ) ...> ( return \(0\|<+...x...+>\|ptr\); | return@p2 ...; ) @script:python@ p1 << r.p1; p2 << r.p2; @@ print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line) // </smpl> Signed-off-by: Julia Lawall <julia@xxxxxxx> --- arch/mips/txx9/generic/setup.c | 9 +++++++-- 1 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c index a205e2b..5744af2 100644 --- a/arch/mips/txx9/generic/setup.c +++ b/arch/mips/txx9/generic/setup.c @@ -781,8 +781,10 @@ void __init txx9_iocled_init(unsigned long baseaddr, if (!iocled) return; iocled->mmioaddr = ioremap(baseaddr, 1); - if (!iocled->mmioaddr) + if (!iocled->mmioaddr) { + kfree(iocled); return; + } iocled->chip.get = txx9_iocled_get; iocled->chip.set = txx9_iocled_set; iocled->chip.direction_input = txx9_iocled_dir_in; @@ -790,8 +792,11 @@ void __init txx9_iocled_init(unsigned long baseaddr, iocled->chip.label = "iocled"; iocled->chip.base = basenum; iocled->chip.ngpio = num; - if (gpiochip_add(&iocled->chip)) + if (gpiochip_add(&iocled->chip)) { + iounmap(iocled->mmioaddr); + kfree(iocled); return; + } if (basenum < 0) basenum = iocled->chip.base;
