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authorFlorin Coras <fcoras@cisco.com>2019-06-11 14:33:03 -0700
committerFlorin Coras <fcoras@cisco.com>2019-06-11 14:33:03 -0700
commitcab4733a7fceb4ead38fe442ffe682ad533dfa28 (patch)
tree5d1fc1f654271f9081d32b4eec1f5e211f196c8f
parent4f3c1042667a77e9c19dfbd51d3922cb5d37ea18 (diff)
vlib: avoid retrieving freed file in epoll
Type:fix Change-Id: Id7f4f6e2a2f844085f511a33aa1db3968f5d97bb Signed-off-by: Florin Coras <fcoras@cisco.com>
-rw-r--r--src/vlib/unix/input.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/src/vlib/unix/input.c b/src/vlib/unix/input.c
index 43bb206eb29..98cb133409f 100644
--- a/src/vlib/unix/input.c
+++ b/src/vlib/unix/input.c
@@ -272,17 +272,18 @@ linux_epoll_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
for (e = em->epoll_events; e < em->epoll_events + n_fds_ready; e++)
{
u32 i = e->data.u32;
- clib_file_t *f = pool_elt_at_index (fm->file_pool, i);
+ clib_file_t *f;
clib_error_t *errors[4];
int n_errors = 0;
+ /*
+ * Under rare scenarios, epoll may still post us events for the
+ * deleted file descriptor. We just deal with it and throw away the
+ * events for the corresponding file descriptor.
+ */
+ f = fm->file_pool + i;
if (PREDICT_FALSE (pool_is_free (fm->file_pool, f)))
{
- /*
- * Under rare scenerop, epoll may still post us events for the
- * deleted file descriptor. We just deal with it and throw away the
- * events for the corresponding file descriptor.
- */
if (e->events & EPOLLIN)
{
errors[n_errors] =