| Message ID | ZsZa5xRcsLq9D+RX@elsanto |
|---|---|
| State | New |
| Headers | show |
| Series | [next] wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_cmd_802_11_scan_ext() | expand |
On Wed, Aug 21, 2024 at 03:23:51PM -0600, Gustavo A. R. Silva wrote: > Replace one-element array with a flexible-array member in > `struct host_cmd_ds_802_11_scan_ext`. > > With this, fix the following warning: > > elo 16 17:51:58 surfacebook kernel: ------------[ cut here ]------------ > elo 16 17:51:58 surfacebook kernel: memcpy: detected field-spanning write (size 243) of single field "ext_scan->tlv_buffer" at drivers/net/wireless/marvell/mwifiex/scan.c:2239 (size 1) > elo 16 17:51:58 surfacebook kernel: WARNING: CPU: 0 PID: 498 at drivers/net/wireless/marvell/mwifiex/scan.c:2239 mwifiex_cmd_802_11_scan_ext+0x83/0x90 [mwifiex] Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Thank you!
On Wed, Aug 21, 2024 at 03:23:51PM -0600, Gustavo A. R. Silva wrote: > Replace one-element array with a flexible-array member in > `struct host_cmd_ds_802_11_scan_ext`. > > With this, fix the following warning: > > elo 16 17:51:58 surfacebook kernel: ------------[ cut here ]------------ > elo 16 17:51:58 surfacebook kernel: memcpy: detected field-spanning write (size 243) of single field "ext_scan->tlv_buffer" at drivers/net/wireless/marvell/mwifiex/scan.c:2239 (size 1) > elo 16 17:51:58 surfacebook kernel: WARNING: CPU: 0 PID: 498 at drivers/net/wireless/marvell/mwifiex/scan.c:2239 mwifiex_cmd_802_11_scan_ext+0x83/0x90 [mwifiex] > > Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Closes: https://lore.kernel.org/linux-hardening/ZsZNgfnEwOcPdCly@black.fi.intel.com/ > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Acked-by: Brian Norris <briannorris@chromium.org>
"Gustavo A. R. Silva" <gustavoars@kernel.org> wrote: > Replace one-element array with a flexible-array member in > `struct host_cmd_ds_802_11_scan_ext`. > > With this, fix the following warning: > > elo 16 17:51:58 surfacebook kernel: ------------[ cut here ]------------ > elo 16 17:51:58 surfacebook kernel: memcpy: detected field-spanning write (size 243) of single field "ext_scan->tlv_buffer" at drivers/net/wireless/marvell/mwifiex/scan.c:2239 (size 1) > elo 16 17:51:58 surfacebook kernel: WARNING: CPU: 0 PID: 498 at drivers/net/wireless/marvell/mwifiex/scan.c:2239 mwifiex_cmd_802_11_scan_ext+0x83/0x90 [mwifiex] > > Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Closes: https://lore.kernel.org/linux-hardening/ZsZNgfnEwOcPdCly@black.fi.intel.com/ > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Acked-by: Brian Norris <briannorris@chromium.org> Patch applied to wireless-next.git, thanks. 498365e52beb wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_cmd_802_11_scan_ext()
diff --git a/drivers/net/wireless/marvell/mwifiex/fw.h b/drivers/net/wireless/marvell/mwifiex/fw.h index e91def0afa14..d03129d5d24e 100644 --- a/drivers/net/wireless/marvell/mwifiex/fw.h +++ b/drivers/net/wireless/marvell/mwifiex/fw.h @@ -1627,7 +1627,7 @@ struct host_cmd_ds_802_11_scan_rsp { struct host_cmd_ds_802_11_scan_ext { u32 reserved; - u8 tlv_buffer[1]; + u8 tlv_buffer[]; } __packed; struct mwifiex_ie_types_bss_mode { diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c index e782d652cb93..f7153472e2a2 100644 --- a/drivers/net/wireless/marvell/mwifiex/scan.c +++ b/drivers/net/wireless/marvell/mwifiex/scan.c @@ -2536,8 +2536,7 @@ int mwifiex_ret_802_11_scan_ext(struct mwifiex_private *priv, ext_scan_resp = &resp->params.ext_scan; tlv = (void *)ext_scan_resp->tlv_buffer; - buf_left = le16_to_cpu(resp->size) - (sizeof(*ext_scan_resp) + S_DS_GEN - - 1); + buf_left = le16_to_cpu(resp->size) - (sizeof(*ext_scan_resp) + S_DS_GEN); while (buf_left >= sizeof(struct mwifiex_ie_types_header)) { type = le16_to_cpu(tlv->type);
Replace one-element array with a flexible-array member in `struct host_cmd_ds_802_11_scan_ext`. With this, fix the following warning: elo 16 17:51:58 surfacebook kernel: ------------[ cut here ]------------ elo 16 17:51:58 surfacebook kernel: memcpy: detected field-spanning write (size 243) of single field "ext_scan->tlv_buffer" at drivers/net/wireless/marvell/mwifiex/scan.c:2239 (size 1) elo 16 17:51:58 surfacebook kernel: WARNING: CPU: 0 PID: 498 at drivers/net/wireless/marvell/mwifiex/scan.c:2239 mwifiex_cmd_802_11_scan_ext+0x83/0x90 [mwifiex] Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Closes: https://lore.kernel.org/linux-hardening/ZsZNgfnEwOcPdCly@black.fi.intel.com/ Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> --- drivers/net/wireless/marvell/mwifiex/fw.h | 2 +- drivers/net/wireless/marvell/mwifiex/scan.c | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-)