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| author | Andrew Donnellan <andrew.donnellan@au1.ibm.com> | 2016-07-15 17:20:36 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-07-19 20:12:29 +1000 |
| commit | 8fbaa51d43ef2c6a72849ec34060910723a0365f (patch) | |
| tree | 8a6fa9290c3075f25b84154f6300cbffe3e94ed9 /drivers/misc/cxl | |
| parent | 1e44727a0b220f6ead12fefcff997354be0f0f02 (diff) | |
| download | linux-8fbaa51d43ef2c6a72849ec34060910723a0365f.tar.gz linux-8fbaa51d43ef2c6a72849ec34060910723a0365f.tar.bz2 linux-8fbaa51d43ef2c6a72849ec34060910723a0365f.zip | |
cxl: fix potential NULL dereference in free_adapter()
If kzalloc() fails when allocating adapter->guest in
cxl_guest_init_adapter(), we call free_adapter() before erroring out.
free_adapter() in turn attempts to dereference adapter->guest, which in
this case is NULL.
In free_adapter(), skip the adapter->guest cleanup if adapter->guest is
NULL.
Fixes: 14baf4d9c739 ("cxl: Add guest-specific code")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc/cxl')
| -rw-r--r-- | drivers/misc/cxl/guest.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c index ee7148e78ca7..9aa58a77a24d 100644 --- a/drivers/misc/cxl/guest.c +++ b/drivers/misc/cxl/guest.c @@ -1055,16 +1055,18 @@ static void free_adapter(struct cxl *adapter) struct irq_avail *cur; int i; - if (adapter->guest->irq_avail) { - for (i = 0; i < adapter->guest->irq_nranges; i++) { - cur = &adapter->guest->irq_avail[i]; - kfree(cur->bitmap); + if (adapter->guest) { + if (adapter->guest->irq_avail) { + for (i = 0; i < adapter->guest->irq_nranges; i++) { + cur = &adapter->guest->irq_avail[i]; + kfree(cur->bitmap); + } + kfree(adapter->guest->irq_avail); } - kfree(adapter->guest->irq_avail); + kfree(adapter->guest->status); + kfree(adapter->guest); } - kfree(adapter->guest->status); cxl_remove_adapter_nr(adapter); - kfree(adapter->guest); kfree(adapter); } |