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authorNicholas Bellinger <nab@linux-iscsi.org>2014-06-06 00:52:57 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-16 13:42:53 -0700
commit50911760bc0afc84ce85c0e26433bf3134563052 (patch)
treee46c7e340979615c5d6edb69755e4fe1f099374d /drivers/target
parentc39e89784d7319f6e87d6bfb17e75fd8b95e07e2 (diff)
downloadlinux-linaro-stable-50911760bc0afc84ce85c0e26433bf3134563052.tar.gz
target: Fix alua_access_state attribute OOPs for un-configured devices
commit f1453773514bb8b0bba0716301e8c8f17f8d39c7 upstream. This patch fixes a OOPs where an attempt to write to the per-device alua_access_state configfs attribute at: /sys/kernel/config/target/core/$HBA/$DEV/alua/$TG_PT_GP/alua_access_state results in an NULL pointer dereference when the backend device has not yet been configured. This patch adds an explicit check for DF_CONFIGURED, and fails with -ENODEV to avoid this case. Reported-by: Chris Boot <crb@tiger-computing.co.uk> Reported-by: Philip Gaw <pgaw@darktech.org.uk> Cc: Chris Boot <crb@tiger-computing.co.uk> Cc: Philip Gaw <pgaw@darktech.org.uk> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_configfs.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 4a8bd36d3958..8cda4080b597 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -2034,6 +2034,11 @@ static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_state(
" tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
return -EINVAL;
}
+ if (!(dev->dev_flags & DF_CONFIGURED)) {
+ pr_err("Unable to set alua_access_state while device is"
+ " not configured\n");
+ return -ENODEV;
+ }
ret = strict_strtoul(page, 0, &tmp);
if (ret < 0) {