| Message ID | 1553223955-7350-5-git-send-email-wen.yang99@zte.com.cn (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [1/5] powerpc/sparse: fix possible object reference leak | expand |
| Context | Check | Description |
|---|---|---|
| snowpatch_ozlabs/apply_patch | success | Successfully applied on branch next (9e98c678c2d6ae3a17cb2de55d17f69dddaa231b) |
| snowpatch_ozlabs/build-ppc64le | success | Build succeeded |
| snowpatch_ozlabs/build-ppc64be | success | Build succeeded |
| snowpatch_ozlabs/build-ppc64e | success | Build succeeded |
| snowpatch_ozlabs/build-pmac32 | success | Build succeeded |
| snowpatch_ozlabs/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 7 lines checked |
On 03/22/2019 03:05 AM, Wen Yang wrote: > The call to of_find_compatible_node returns a node pointer with refcount > incremented thus it must be explicitly decremented after the last > usage. > irq_domain_add_linear also calls of_node_get to increase refcount, > so irq_domain will not be affected when it is released. Should you have a: Fixes: a8db8cf0d894 ("irq_domain: Replace irq_alloc_host() with revmap-specific initializers") If not, it means your change is in contradiction with commit b1725c9319aa ("[POWERPC] arch/powerpc/sysdev: Add missing of_node_put") > > Detected by coccinelle with the following warnings: > ./arch/powerpc/platforms/8xx/pic.c:158:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 136, but without a corresponding object release within this function. > > Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> > Cc: Vitaly Bordug <vitb@kernel.crashing.org> > Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> > Cc: Paul Mackerras <paulus@samba.org> > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-kernel@vger.kernel.org > --- > arch/powerpc/platforms/8xx/pic.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/powerpc/platforms/8xx/pic.c b/arch/powerpc/platforms/8xx/pic.c > index 8d5a25d..13d880b 100644 > --- a/arch/powerpc/platforms/8xx/pic.c > +++ b/arch/powerpc/platforms/8xx/pic.c > @@ -155,6 +155,7 @@ int mpc8xx_pic_init(void) > ret = -ENOMEM; > goto out; > } > + of_node_put(np); > return 0; > > out: > I guess it would be better as follows: --- a/arch/powerpc/platforms/8xx/pic.c +++ b/arch/powerpc/platforms/8xx/pic.c @@ -153,9 +153,7 @@ int mpc8xx_pic_init(void) if (mpc8xx_pic_host == NULL) { printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n"); ret = -ENOMEM; - goto out; } - return 0; out: of_node_put(np); Christophe
diff --git a/arch/powerpc/platforms/8xx/pic.c b/arch/powerpc/platforms/8xx/pic.c index 8d5a25d..13d880b 100644 --- a/arch/powerpc/platforms/8xx/pic.c +++ b/arch/powerpc/platforms/8xx/pic.c @@ -155,6 +155,7 @@ int mpc8xx_pic_init(void) ret = -ENOMEM; goto out; } + of_node_put(np); return 0; out:
The call to of_find_compatible_node returns a node pointer with refcount incremented thus it must be explicitly decremented after the last usage. irq_domain_add_linear also calls of_node_get to increase refcount, so irq_domain will not be affected when it is released. Detected by coccinelle with the following warnings: ./arch/powerpc/platforms/8xx/pic.c:158:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 136, but without a corresponding object release within this function. Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> Cc: Vitaly Bordug <vitb@kernel.crashing.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org --- arch/powerpc/platforms/8xx/pic.c | 1 + 1 file changed, 1 insertion(+)