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authorJacob Keller <jacob.e.keller@intel.com>2023-07-10 23:41:27 +0300
committerTony Nguyen <anthony.l.nguyen@intel.com>2023-07-21 18:49:37 +0300
commita2f054c10bef0b54600ec9cb776508443e941343 (patch)
treeaed0f3215c5c3f3aca7900955d38d73481e8fe60 /drivers/net
parent043b1f185fb0f3939b7427f634787706f45411c4 (diff)
downloadlinux-a2f054c10bef0b54600ec9cb776508443e941343.tar.xz
iavf: fix potential deadlock on allocation failure
In iavf_adminq_task(), if kzalloc() fails to allocate the event.msg_buf, the function will exit without releasing the adapter->crit_lock. This is unlikely, but if it happens, the next access to that mutex will deadlock. Fix this by moving the unlock to the end of the function, and adding a new label to allow jumping to the unlock portion of the function exit flow. Fixes: fc2e6b3b132a ("iavf: Rework mutexes for better synchronisation") Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Rafal Romanowski <rafal.romanowski@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/intel/iavf/iavf_main.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 3a88d413ddee..939c8126eb43 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -3264,7 +3264,7 @@ static void iavf_adminq_task(struct work_struct *work)
event.buf_len = IAVF_MAX_AQ_BUF_SIZE;
event.msg_buf = kzalloc(event.buf_len, GFP_KERNEL);
if (!event.msg_buf)
- goto out;
+ goto unlock;
do {
ret = iavf_clean_arq_element(hw, &event, &pending);
@@ -3279,7 +3279,6 @@ static void iavf_adminq_task(struct work_struct *work)
if (pending != 0)
memset(event.msg_buf, 0, IAVF_MAX_AQ_BUF_SIZE);
} while (pending);
- mutex_unlock(&adapter->crit_lock);
if (iavf_is_reset_in_progress(adapter))
goto freedom;
@@ -3323,6 +3322,8 @@ static void iavf_adminq_task(struct work_struct *work)
freedom:
kfree(event.msg_buf);
+unlock:
+ mutex_unlock(&adapter->crit_lock);
out:
/* re-enable Admin queue interrupt cause */
iavf_misc_irq_enable(adapter);