René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"assert on aix","articleBody":"### Reproduction steps\r\nClone a repository on AIX. The following assert occurs:\r\n**Assertion failed: __EX, file .../libgit2-0.27.3/src/index.c, line 460**\r\n\r\nCall stack:\r\n...\r\n-\u003e iterator_for_filesystem(...)\r\n  -\u003e git_index_snapshot_new(...)\r\n    -\u003e git_index_free(...)\r\n\r\n*git_vector_dup()* fails in *git_index_snapshot_new()*, the index is released but the *readers* variable was increased before which leads to the assert.\r\n\r\n*git_vector_dup()* fails because a *malloc(0)* on AIX returns a NULL pointer:\r\n\r\nv-\u003econtents = git__malloc(bytes);\r\nGITERR_CHECK_ALLOC(v-\u003econtents);\r\n\r\n### Expected behavior\r\nIf *malloc()* is called with 0 bytes the return value of NULL is valid (at least on AIX) and should not be treated as an error.\r\n\r\n### Version of libgit2 (release number or SHA1)\r\n0.27.3\r\n\r\n### Operating system(s) tested\r\nAIX 7.1\r\ngcc 4.8.2","author":{"url":"https://github.com/hkrummeck","@type":"Person","name":"hkrummeck"},"datePublished":"2018-09-11T08:37:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/4802/libgit2/issues/4802"}