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

    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
    This patch reworks the memory allocation a bit to deal with it
    (compile tested only).

    Signed-off-by: Jesper Juhl <>

    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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      Last update: 2007-07-27 23:31    [W:0.021 / U:11.216 seconds]
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