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Subject[PATCH][sas] Fix potential NULL pointer dereference bug in sas_smp_get_phy_events()
Date
Hello,

In sas_smp_get_phy_events() we never test if the call to
alloc_smp_req(RPEL_REQ_SIZE) succeeds or fails. That means we run
the risk of dereferencing a NULL pointer if it does fail. Far
better to test if we got NULL back and in that case return -ENOMEM
just as we already do for the other memory allocation in that
function.
This patch reworks the memory allocation a bit to deal with it
(compile tested only).


Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
---
drivers/scsi/libsas/sas_expander.c | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index b500f0c..85f5145 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -507,14 +507,21 @@ static int sas_dev_present_in_domain(struct asd_sas_port *port,
int sas_smp_get_phy_events(struct sas_phy *phy)
{
int res;
+ u8 *req;
+ u8 *resp;
struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
struct domain_device *dev = sas_find_dev_by_rphy(rphy);
- u8 *req = alloc_smp_req(RPEL_REQ_SIZE);
- u8 *resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL);

+ resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL);
if (!resp)
return -ENOMEM;

+ req = alloc_smp_req(RPEL_REQ_SIZE);
+ if (!req) {
+ res = -ENOMEM;
+ goto out;
+ }
+
req[1] = SMP_REPORT_PHY_ERR_LOG;
req[9] = phy->number;





PS. Please keep me on Cc when replying.


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