ata: libata-core: fix NULL pointer deref in ata_host_alloc_pinfo()

[ Upstream commit bf476fe22aa1851bab4728e0c49025a6a0bea307 ]

In an unlikely (and probably wrong?) case that the 'ppi' parameter of
ata_host_alloc_pinfo() points to an array starting with a NULL pointer,
there's going to be a kernel oops as the 'pi' local variable won't get
reassigned from the initial value of NULL. Initialize 'pi' instead to
'&ata_dummy_port_info' to fix the possible kernel oops for good...

Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.

Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index d3a7b3bb5043c8a20c437f6e3c790ca7af64ab9e..08dc37a62f5a98098b476a7d4af6a95f26324eff 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6180,7 +6180,7 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
                                      const struct ata_port_info * const * ppi,
                                      int n_ports)
 {
-       const struct ata_port_info *pi;
+       const struct ata_port_info *pi = &ata_dummy_port_info;
        struct ata_host *host;
        int i, j;
 
@@ -6188,7 +6188,7 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
        if (!host)
                return NULL;
 
-       for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
+       for (i = 0, j = 0; i < host->n_ports; i++) {
                struct ata_port *ap = host->ports[i];
 
                if (ppi[j])