From: Julia Lawall <julia@xxxxxxx> 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,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> --- drivers/hid/hid-roccat.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-roccat.c b/drivers/hid/hid-roccat.c index e05d48e..f6e80c7 100644 --- a/drivers/hid/hid-roccat.c +++ b/drivers/hid/hid-roccat.c @@ -168,7 +168,7 @@ static int roccat_open(struct inode *inode, struct file *file) printk(KERN_EMERG "roccat device with minor %d doesn't exist\n", minor); error = -ENODEV; - goto exit_unlock; + goto exit_err; } if (!device->open++) { @@ -178,7 +178,7 @@ static int roccat_open(struct inode *inode, struct file *file) PM_HINT_FULLON); if (error < 0) { --device->open; - goto exit_unlock; + goto exit_err; } } error = device->hid->ll_driver->open(device->hid); @@ -187,7 +187,7 @@ static int roccat_open(struct inode *inode, struct file *file) device->hid->ll_driver->power(device->hid, PM_HINT_NORMAL); --device->open; - goto exit_unlock; + goto exit_err; } } @@ -202,6 +202,9 @@ exit_unlock: mutex_unlock(&device->readers_lock); mutex_unlock(&devices_lock); return error; +exit_err: + kfree(reader); + goto exit_unlock; } static int roccat_release(struct inode *inode, struct file *file) -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
