| Message ID | 20241010111830.3474719-1-harshit.m.mogalapalli@oracle.com |
|---|---|
| State | New |
| Headers | show |
| Series | pinctrl: sophgo: fix double free in cv1800_pctrl_dt_node_to_map() | expand |
On Thu, Oct 10, 2024 at 1:24 PM Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com> wrote: > 'map' is allocated using devm_* which takes care of freeing the allocated > data, but in error paths there is a call to pinctrl_utils_free_map() > which also does kfree(map) which leads to a double free. > > Use kcalloc() instead of devm_kcalloc() as freeing is manually handled. > > Fixes: a29d8e93e710 ("pinctrl: sophgo: add support for CV1800B SoC") > Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com> Patch applied for fixes! Yours, Linus Walleij
Le 10/10/2024 à 20:33, Dan Carpenter a écrit : > On Thu, Oct 10, 2024 at 07:17:19PM +0200, Christophe JAILLET wrote: >> Le 10/10/2024 à 13:18, Harshit Mogalapalli a écrit : >>> 'map' is allocated using devm_* which takes care of freeing the allocated >>> data, but in error paths there is a call to pinctrl_utils_free_map() >>> which also does kfree(map) which leads to a double free. >>> >>> Use kcalloc() instead of devm_kcalloc() as freeing is manually handled. >>> >>> Fixes: a29d8e93e710 ("pinctrl: sophgo: add support for CV1800B SoC") >>> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com> >>> --- >>> This is based on static analysis with smatch, only compile tested. >>> --- >>> drivers/pinctrl/sophgo/pinctrl-cv18xx.c | 2 +- >>> 1 file changed, 1 insertion(+), 1 deletion(-) >>> >>> diff --git a/drivers/pinctrl/sophgo/pinctrl-cv18xx.c b/drivers/pinctrl/sophgo/pinctrl-cv18xx.c >>> index d18fc5aa84f7..57f2674e75d6 100644 >>> --- a/drivers/pinctrl/sophgo/pinctrl-cv18xx.c >>> +++ b/drivers/pinctrl/sophgo/pinctrl-cv18xx.c >>> @@ -221,7 +221,7 @@ static int cv1800_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev, >>> if (!grpnames) >>> return -ENOMEM; >>> - map = devm_kcalloc(dev, ngroups * 2, sizeof(*map), GFP_KERNEL); >>> + map = kcalloc(ngroups * 2, sizeof(*map), GFP_KERNEL); >>> if (!map) >>> return -ENOMEM; >> >> Hi, >> >> drivers/pinctrl/nuvoton/pinctrl-ma35.c seems to have the same issue. >> > > Yep. That one is too complicated for Smatch to find. In this case, the kfree() > happened in the cleanup so it was in the same function. > > regards, > dan carpenter > > For the records, I spotted the other case with coccinelle: @ok1@ identifier X, fct; @@ struct pinctrl_ops X = { .dt_node_to_map = fct, .dt_free_map = pinconf_generic_dt_free_map, }; @test1 depends on ok1@ identifier fct = ok1.fct; identifier fct2 =~ "devm"; expression x =~ "map"; @@ int fct(...) { ... * x = fct2(...); ... } @ok2@ identifier X, fct; @@ struct pinctrl_ops X = { .dt_node_to_map = fct, .dt_free_map = pinctrl_utils_free_map, }; @test2 depends on ok2@ identifier fct = ok2.fct; identifier fct2 =~ "devm"; expression x =~ "map"; @@ int fct(...) { ... * x = fct2(...); ... } CJ
diff --git a/drivers/pinctrl/sophgo/pinctrl-cv18xx.c b/drivers/pinctrl/sophgo/pinctrl-cv18xx.c index d18fc5aa84f7..57f2674e75d6 100644 --- a/drivers/pinctrl/sophgo/pinctrl-cv18xx.c +++ b/drivers/pinctrl/sophgo/pinctrl-cv18xx.c @@ -221,7 +221,7 @@ static int cv1800_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev, if (!grpnames) return -ENOMEM; - map = devm_kcalloc(dev, ngroups * 2, sizeof(*map), GFP_KERNEL); + map = kcalloc(ngroups * 2, sizeof(*map), GFP_KERNEL); if (!map) return -ENOMEM;
'map' is allocated using devm_* which takes care of freeing the allocated data, but in error paths there is a call to pinctrl_utils_free_map() which also does kfree(map) which leads to a double free. Use kcalloc() instead of devm_kcalloc() as freeing is manually handled. Fixes: a29d8e93e710 ("pinctrl: sophgo: add support for CV1800B SoC") Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com> --- This is based on static analysis with smatch, only compile tested. --- drivers/pinctrl/sophgo/pinctrl-cv18xx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)