From: Sergey Shtylyov s.shtylyov@omp.ru
stable inclusion from stable-4.19.249 commit a810bd5af06977a847d1f202b22d7defd5c62497 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5I4FP CVE: NA
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[ 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 Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- drivers/ata/libata-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 290ff99bf1d8..0bcdc5261480 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -6240,7 +6240,7 @@ 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;
@@ -6248,7 +6248,7 @@ 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])