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| author | Jack Morgenstein <jackm@dev.mellanox.co.il> | 2020-05-07 10:10:12 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2020-05-12 11:47:48 -0300 |
| commit | 1901b91f99821955eac2bd48fe25ee983385dc00 (patch) | |
| tree | 1006481668b6c45ac39ceafcf24f2238b6cbf8f6 | |
| parent | fa8dac3968635dec8518a13ac78d662f2aa88e4d (diff) | |
| download | linux-1901b91f99821955eac2bd48fe25ee983385dc00.tar.gz | |
IB/core: Fix potential NULL pointer dereference in pkey cache
The IB core pkey cache is populated by procedure ib_cache_update().
Initially, the pkey cache pointer is NULL. ib_cache_update allocates a
buffer and populates it with the device's pkeys, via repeated calls to
procedure ib_query_pkey().
If there is a failure in populating the pkey buffer via ib_query_pkey(),
ib_cache_update does not replace the old pkey buffer cache with the
updated one -- it leaves the old cache as is.
Since initially the pkey buffer cache is NULL, when calling
ib_cache_update the first time, a failure in ib_query_pkey() will cause
the pkey buffer cache pointer to remain NULL.
In this situation, any calls subsequent to ib_get_cached_pkey(),
ib_find_cached_pkey(), or ib_find_cached_pkey_exact() will try to
dereference the NULL pkey cache pointer, causing a kernel panic.
Fix this by checking the ib_cache_update() return value.
Fixes: 8faea9fd4a39 ("RDMA/cache: Move the cache per-port data into the main ib_port_data")
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Link: https://lore.kernel.org/r/20200507071012.100594-1-leon@kernel.org
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
| -rw-r--r-- | drivers/infiniband/core/cache.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c index 717b798cddad4f..a670209bbce606 100644 --- a/drivers/infiniband/core/cache.c +++ b/drivers/infiniband/core/cache.c @@ -1553,8 +1553,11 @@ int ib_cache_setup_one(struct ib_device *device) if (err) return err; - rdma_for_each_port (device, p) - ib_cache_update(device, p, true); + rdma_for_each_port (device, p) { + err = ib_cache_update(device, p, true); + if (err) + return err; + } return 0; } |