| Message ID | 20210928193107.GA262595@embeddedor (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 69508d43334e3b09c344f662272bcf24a5b508ed |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [v2,net-next] net_sched: Use struct_size() and flex_array_size() helpers | expand |
| Context | Check | Description |
|---|---|---|
| netdev/cover_letter | success | Link |
| netdev/fixes_present | success | Link |
| netdev/patch_count | success | Link |
| netdev/tree_selection | success | Clearly marked for net-next |
| netdev/subject_prefix | success | Link |
| netdev/cc_maintainers | success | CCed 6 of 6 maintainers |
| netdev/source_inline | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Link |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/build_32bit | success | Errors and warnings before: 2 this patch: 2 |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/verify_fixes | success | Link |
| netdev/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 24 lines checked |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 2 this patch: 2 |
| netdev/header_inline | success | Link |
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 5e90e9b160e3..e1a40d3b1ed0 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -507,20 +507,21 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt, list_for_each_entry(stab, &qdisc_stab_list, list) { if (memcmp(&stab->szopts, s, sizeof(*s))) continue; - if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) + if (tsize > 0 && + memcmp(stab->data, tab, flex_array_size(stab, data, tsize))) continue; stab->refcnt++; return stab; } - stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); + stab = kmalloc(struct_size(stab, data, tsize), GFP_KERNEL); if (!stab) return ERR_PTR(-ENOMEM); stab->refcnt = 1; stab->szopts = *s; if (tsize > 0) - memcpy(stab->data, tab, tsize * sizeof(u16)); + memcpy(stab->data, tab, flex_array_size(stab, data, tsize)); list_add_tail(&stab->list, &qdisc_stab_list);
Make use of the struct_size() and flex_array_size() helpers instead of an open-coded version, in order to avoid any potential type mistakes or integer overflows that, in the worse scenario, could lead to heap overflows. Link: https://github.com/KSPP/linux/issues/160 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> --- Changes in v2: - Rebase on top of net-next/master. net/sched/sch_api.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)