Author: sephe Date: Fri Feb 5 03:46:53 2016 New Revision: 295295 URL: https://svnweb.freebsd.org/changeset/base/295295
Log: hyperv/stor: Fix the NULL pointer dereference Reported by: Netapp Submitted by: Hongjiang Zhang <honzhan microsoft com> Reviewed by: adrian, sephe, Dexuan Cui <decui microsoft com> Approved by: adrian (mentor) MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5097 Modified: head/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Modified: head/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c ============================================================================== --- head/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Fri Feb 5 03:20:27 2016 (r295294) +++ head/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Fri Feb 5 03:46:53 2016 (r295295) @@ -1524,13 +1524,12 @@ static void storvsc_destroy_bounce_buffer(struct sglist *sgl) { struct hv_sgl_node *sgl_node = NULL; - - sgl_node = LIST_FIRST(&g_hv_sgl_page_pool.in_use_sgl_list); - LIST_REMOVE(sgl_node, link); - if (NULL == sgl_node) { + if (LIST_EMPTY(&g_hv_sgl_page_pool.in_use_sgl_list)) { printf("storvsc error: not enough in use sgl\n"); return; } + sgl_node = LIST_FIRST(&g_hv_sgl_page_pool.in_use_sgl_list); + LIST_REMOVE(sgl_node, link); sgl_node->sgl_data = sgl; LIST_INSERT_HEAD(&g_hv_sgl_page_pool.free_sgl_list, sgl_node, link); } @@ -1556,12 +1555,12 @@ storvsc_create_bounce_buffer(uint16_t se struct hv_sgl_node *sgl_node = NULL; /* get struct sglist from free_sgl_list */ - sgl_node = LIST_FIRST(&g_hv_sgl_page_pool.free_sgl_list); - LIST_REMOVE(sgl_node, link); - if (NULL == sgl_node) { + if (LIST_EMPTY(&g_hv_sgl_page_pool.free_sgl_list)) { printf("storvsc error: not enough free sgl\n"); return NULL; } + sgl_node = LIST_FIRST(&g_hv_sgl_page_pool.free_sgl_list); + LIST_REMOVE(sgl_node, link); bounce_sgl = sgl_node->sgl_data; LIST_INSERT_HEAD(&g_hv_sgl_page_pool.in_use_sgl_list, sgl_node, link); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
