6.6-stable review patch. If anyone has any objections, please let me know.
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From: Aleksandr Mishin amishin@t-argos.ru
[ Upstream commit b0c9a26435413b81799047a7be53255640432547 ]
In case of region creation fail in ipc_devlink_create_region(), previously created regions delete process starts from tainted pointer which actually holds error code value. Fix this bug by decreasing region index before delete.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 4dcd183fbd67 ("net: wwan: iosm: devlink registration") Signed-off-by: Aleksandr Mishin amishin@t-argos.ru Acked-by: Sergey Ryazanov ryazanov.s.a@gmail.com Reviewed-by: Simon Horman horms@kernel.org Link: https://lore.kernel.org/r/20240604082500.20769-1-amishin@t-argos.ru Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wwan/iosm/iosm_ipc_devlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wwan/iosm/iosm_ipc_devlink.c b/drivers/net/wwan/iosm/iosm_ipc_devlink.c index 2fe724d623c06..33c5a46f1b922 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_devlink.c +++ b/drivers/net/wwan/iosm/iosm_ipc_devlink.c @@ -210,7 +210,7 @@ static int ipc_devlink_create_region(struct iosm_devlink *devlink) rc = PTR_ERR(devlink->cd_regions[i]); dev_err(devlink->dev, "Devlink region fail,err %d", rc); /* Delete previously created regions */ - for ( ; i >= 0; i--) + for (i--; i >= 0; i--) devlink_region_destroy(devlink->cd_regions[i]); goto region_create_fail; }