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authorAndrew Yourtchenko <ayourtch@gmail.com>2018-11-23 09:22:10 +0100
committerAndrew Yourtchenko <ayourtch@gmail.com>2018-11-23 11:45:56 +0000
commite0152461cbc84d6d4df3f05dddabe992c1c59052 (patch)
tree35c267aedb48fc902aaeb741e459552d67547c1f /src/plugins/acl/hash_lookup.c
parent2a7b546fb05ecf5871350eca1f8fc6016c2d4ca8 (diff)
acl-plugin: fix coverity error that the fix related for [VPP-1502] has triggered
Fix the trivial use-before-check copypaste error. There was a more subtle issue with that patch that Coverity didn't notice: namely, vec_validate(v, len-1) is a terrible idea if len happens to be == 0. Fix that. Change-Id: I0fab8b1750e9e9973eefb5d39f35e4c3a13fc66f Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
Diffstat (limited to 'src/plugins/acl/hash_lookup.c')
-rw-r--r--src/plugins/acl/hash_lookup.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/src/plugins/acl/hash_lookup.c b/src/plugins/acl/hash_lookup.c
index 0568a67affe..ff671d1c092 100644
--- a/src/plugins/acl/hash_lookup.c
+++ b/src/plugins/acl/hash_lookup.c
@@ -603,6 +603,10 @@ hash_acl_set_heap(acl_main_t *am)
am->hash_lookup_mheap = mheap_alloc_with_lock (0 /* use VM */ ,
am->hash_lookup_mheap_size,
1 /* locked */);
+ if (0 == am->hash_lookup_mheap) {
+ clib_error("ACL plugin failed to allocate lookup heap of %U bytes",
+ format_memory_size, am->hash_lookup_mheap_size);
+ }
#if USE_DLMALLOC != 0
/*
* DLMALLOC is being "helpful" in that it ignores the heap size parameter
@@ -614,10 +618,6 @@ hash_acl_set_heap(acl_main_t *am)
*/
mspace_disable_expand(am->hash_lookup_mheap);
#endif
- if (0 == am->hash_lookup_mheap) {
- clib_error("ACL plugin failed to allocate lookup heap of %U bytes",
- format_memory_size, am->hash_lookup_mheap_size);
- }
}
void *oldheap = clib_mem_set_heap(am->hash_lookup_mheap);
return oldheap;
@@ -749,9 +749,11 @@ hash_acl_apply(acl_main_t *am, u32 lc_index, int acl_index, u32 acl_position)
vec_validate(am->hash_applied_mask_info_vec_by_lc_index, lc_index);
/* since we know (in case of no split) how much we expand, preallocate that space */
- int old_vec_len = vec_len(*applied_hash_aces);
- vec_validate((*applied_hash_aces), old_vec_len + vec_len(ha->rules) - 1);
- _vec_len((*applied_hash_aces)) = old_vec_len;
+ if (vec_len(ha->rules) > 0) {
+ int old_vec_len = vec_len(*applied_hash_aces);
+ vec_validate((*applied_hash_aces), old_vec_len + vec_len(ha->rules) - 1);
+ _vec_len((*applied_hash_aces)) = old_vec_len;
+ }
/* add the rules from the ACL to the hash table for lookup and append to the vector*/
for(i=0; i < vec_len(ha->rules); i++) {
@@ -1190,8 +1192,10 @@ void hash_acl_add(acl_main_t *am, int acl_index)
is a mask type, increment a reference count for that mask type */
/* avoid small requests by preallocating the entire vector before running the additions */
- vec_validate(ha->rules, a->count-1);
- vec_reset_length(ha->rules);
+ if (a->count > 0) {
+ vec_validate(ha->rules, a->count-1);
+ vec_reset_length(ha->rules);
+ }
for(i=0; i < a->count; i++) {
hash_ace_info_t ace_info;