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| author | Julia Lawall <julia@diku.dk> | 2008-10-13 21:59:04 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-14 10:23:27 -0700 |
| commit | 79aa79bac979323a8cb10438be16d29cf252167d (patch) | |
| tree | 88dd571315fb473a45e47cc42ea0a4315726407d /arch/m68k/mm | |
| parent | 56f26f7b78af36d0f048a9403084870d2ffb549f (diff) | |
| download | linux-79aa79bac979323a8cb10438be16d29cf252167d.tar.gz linux-79aa79bac979323a8cb10438be16d29cf252167d.tar.bz2 linux-79aa79bac979323a8cb10438be16d29cf252167d.zip | |
arch/m68k/mm/kmap.c: introduce missing kfree
Error handling code following a kmalloc should free the allocated data.
The semantic match that finds the problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,l;
position p1,p2;
expression *ptr != NULL;
@@
(
if ((x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...)) == NULL) S
|
x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
..
if (x == NULL) S
)
<... when != x
when != if (...) { <+...x...+> }
x->f = E
..>
(
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@diku.dk>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/m68k/mm')
| -rw-r--r-- | arch/m68k/mm/kmap.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c index 46b7d6035aab..df620ac2a296 100644 --- a/arch/m68k/mm/kmap.c +++ b/arch/m68k/mm/kmap.c @@ -66,8 +66,10 @@ static struct vm_struct *get_io_area(unsigned long size) for (p = &iolist; (tmp = *p) ; p = &tmp->next) { if (size + addr < (unsigned long)tmp->addr) break; - if (addr > KMAP_END-size) + if (addr > KMAP_END-size) { + kfree(area); return NULL; + } addr = tmp->size + (unsigned long)tmp->addr; } area->addr = (void *)addr; |