mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

libbpf: Fix potential NULL pointer dereference 

Wait until after the UMEM is checked for null to dereference it.

Fixes: 43f1bc1eff ("libbpf: Restore umem state after socket create failure")
Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210408052009.7844-1-ciara.loftus@intel.com
This commit is contained in:
Ciara Loftus 2021-04-08 05:20:09 +00:00 committed by Daniel Borkmann
parent 1ffbc7ea91
commit afd0be7299
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
tools/lib/bpf/xsk.c
View File

@ -852,18 +852,19 @@ int xsk_socket__create_shared(struct xsk_socket **xsk_ptr,
struct xsk_ring_cons *comp,
const struct xsk_socket_config *usr_config)
{
bool unmap, rx_setup_done = false, tx_setup_done = false;
void *rx_map = NULL, *tx_map = NULL;
struct sockaddr_xdp sxdp = {};
struct xdp_mmap_offsets off;
struct xsk_socket *xsk;
struct xsk_ctx *ctx;
int err, ifindex;
bool unmap = umem->fill_save != fill;
bool rx_setup_done = false, tx_setup_done = false;
if (!umem || !xsk_ptr || !(rx || tx))
return -EFAULT;
unmap = umem->fill_save != fill;
xsk = calloc(1, sizeof(*xsk));
if (!xsk)
return -ENOMEM;