diff options
| author | Tuo Li <islituo@gmail.com> | 2021-08-06 06:30:29 -0700 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2021-08-19 11:33:35 -0300 |
| commit | cbe71c61992c38f72c2b625b2ef25916b9f0d060 (patch) | |
| tree | 82c67e96e84228f0e7e3be6f0bb55333414958c4 | |
| parent | 0032640204a7d73bef163638c34a4642f8c9ed07 (diff) | |
IB/hfi1: Fix possible null-pointer dereference in _extend_sdma_tx_descs()
kmalloc_array() is called to allocate memory for tx->descp. If it fails,
the function __sdma_txclean() is called:
__sdma_txclean(dd, tx);
However, in the function __sdma_txclean(), tx-descp is dereferenced if
tx->num_desc is not zero:
sdma_unmap_desc(dd, &tx->descp[0]);
To fix this possible null-pointer dereference, assign the return value of
kmalloc_array() to a local variable descp, and then assign it to tx->descp
if it is not NULL. Otherwise, go to enomem.
Fixes: 7724105686e7 ("IB/hfi1: add driver files")
Link: https://lore.kernel.org/r/20210806133029.194964-1-islituo@gmail.com
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Tuo Li <islituo@gmail.com>
Tested-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Acked-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
| -rw-r--r-- | drivers/infiniband/hw/hfi1/sdma.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/infiniband/hw/hfi1/sdma.c b/drivers/infiniband/hw/hfi1/sdma.c index eb15c310d63d..e83dc562629e 100644 --- a/drivers/infiniband/hw/hfi1/sdma.c +++ b/drivers/infiniband/hw/hfi1/sdma.c @@ -3055,6 +3055,7 @@ static void __sdma_process_event(struct sdma_engine *sde, static int _extend_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx) { int i; + struct sdma_desc *descp; /* Handle last descriptor */ if (unlikely((tx->num_desc == (MAX_DESC - 1)))) { @@ -3075,12 +3076,10 @@ static int _extend_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx) if (unlikely(tx->num_desc == MAX_DESC)) goto enomem; - tx->descp = kmalloc_array( - MAX_DESC, - sizeof(struct sdma_desc), - GFP_ATOMIC); - if (!tx->descp) + descp = kmalloc_array(MAX_DESC, sizeof(struct sdma_desc), GFP_ATOMIC); + if (!descp) goto enomem; + tx->descp = descp; /* reserve last descriptor for coalescing */ tx->desc_limit = MAX_DESC - 1; |