| Message ID | 1360015899-13706-1-git-send-email-dinggnu@gmail.com |
|---|---|
| State | Superseded |
| Headers | show |
Hi, On Tue, Feb 5, 2013 at 7:11 AM, Cong Ding <dinggnu@gmail.com> wrote: > If it goes to eclk through line 1107, the variable res would be NULL. It will > cause a null pointer dereference error if we call release_mem_region. > > Signed-off-by: Cong Ding <dinggnu@gmail.com> > --- > drivers/i2c/busses/i2c-pxa.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c > index 1034d93..eadf1a4 100644 > --- a/drivers/i2c/busses/i2c-pxa.c > +++ b/drivers/i2c/busses/i2c-pxa.c > @@ -1211,7 +1211,8 @@ eremap: > eclk: > kfree(i2c); > emalloc: > - release_mem_region(res->start, resource_size(res)); > + if (!res) if (res)? It's not match with description. and it seems wrong. Thank you, Kyungmin Park > + release_mem_region(res->start, resource_size(res)); > return ret; > } > > -- > 1.7.9.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Feb 05, 2013 at 08:47:10AM +0900, Kyungmin Park wrote: > Hi, > > On Tue, Feb 5, 2013 at 7:11 AM, Cong Ding <dinggnu@gmail.com> wrote: > > If it goes to eclk through line 1107, the variable res would be NULL. It will > > cause a null pointer dereference error if we call release_mem_region. > > > > Signed-off-by: Cong Ding <dinggnu@gmail.com> > > --- > > drivers/i2c/busses/i2c-pxa.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c > > index 1034d93..eadf1a4 100644 > > --- a/drivers/i2c/busses/i2c-pxa.c > > +++ b/drivers/i2c/busses/i2c-pxa.c > > @@ -1211,7 +1211,8 @@ eremap: > > eclk: > > kfree(i2c); > > emalloc: > > - release_mem_region(res->start, resource_size(res)); > > + if (!res) > if (res)? > It's not match with description. and it seems wrong. sorry my fault. will send version 2. - cong > > Thank you, > Kyungmin Park > > + release_mem_region(res->start, resource_size(res)); > > return ret; > > } > > > > -- > > 1.7.9.5 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index 1034d93..eadf1a4 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -1211,7 +1211,8 @@ eremap: eclk: kfree(i2c); emalloc: - release_mem_region(res->start, resource_size(res)); + if (!res) + release_mem_region(res->start, resource_size(res)); return ret; }
If it goes to eclk through line 1107, the variable res would be NULL. It will cause a null pointer dereference error if we call release_mem_region. Signed-off-by: Cong Ding <dinggnu@gmail.com> --- drivers/i2c/busses/i2c-pxa.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)