From: Mauro Carvalho Chehab mchehab+huawei@kernel.org

mainline inclusion from mainline-v6.12-rc7 commit 458ea1c0be991573ec436aa0afa23baacfae101a category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB5AVC CVE: CVE-2024-50289

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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As warned by smatch: drivers/staging/media/av7110/av7110_ca.c:270 dvb_ca_ioctl() warn: potential spectre issue 'av7110->ci_slot' [w] (local cap)

There is a spectre-related vulnerability at the code. Fix it.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Conflicts: drivers/media/pci/ttpci/av7110.h drivers/media/pci/ttpci/av7110_ca.c drivers/staging/media/av7110/av7110.h drivers/staging/media/av7110/av7110_ca.c Signed-off-by: Li Huafei lihuafei1@huawei.com --- drivers/media/pci/ttpci/av7110.h | 4 +++- drivers/media/pci/ttpci/av7110_ca.c | 26 ++++++++++++++++++-------- 2 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/media/pci/ttpci/av7110.h b/drivers/media/pci/ttpci/av7110.h index 809d938ae166..f77766008b97 100644 --- a/drivers/media/pci/ttpci/av7110.h +++ b/drivers/media/pci/ttpci/av7110.h @@ -86,6 +86,8 @@ struct infrared { u32 ir_config; };

+#define MAX_CI_SLOTS 2 + /* place to store all the necessary device information */ struct av7110 {

@@ -166,7 +168,7 @@ struct av7110 {

/* CA */

- struct ca_slot_info ci_slot[2]; + struct ca_slot_info ci_slot[MAX_CI_SLOTS];

enum av7110_video_mode vidmode; struct dmxdev dmxdev; diff --git a/drivers/media/pci/ttpci/av7110_ca.c b/drivers/media/pci/ttpci/av7110_ca.c index c1338e074a3d..7216365331a6 100644 --- a/drivers/media/pci/ttpci/av7110_ca.c +++ b/drivers/media/pci/ttpci/av7110_ca.c @@ -18,6 +18,7 @@ #include <linux/timer.h> #include <linux/poll.h> #include <linux/gfp.h> +#include <linux/nospec.h>

#include "av7110.h" #include "av7110_hw.h" @@ -26,23 +27,28 @@

void CI_handle(struct av7110 *av7110, u8 *data, u16 len) { + unsigned slot_num; + dprintk(8, "av7110:%p\n",av7110);

if (len < 3) return; switch (data[0]) { case CI_MSG_CI_INFO: - if (data[2] != 1 && data[2] != 2) + if (data[2] != 1 && data[2] != MAX_CI_SLOTS) break; + + slot_num = array_index_nospec(data[2] - 1, MAX_CI_SLOTS); + switch (data[1]) { case 0: - av7110->ci_slot[data[2] - 1].flags = 0; + av7110->ci_slot[slot_num].flags = 0; break; case 1: - av7110->ci_slot[data[2] - 1].flags |= CA_CI_MODULE_PRESENT; + av7110->ci_slot[slot_num].flags |= CA_CI_MODULE_PRESENT; break; case 2: - av7110->ci_slot[data[2] - 1].flags |= CA_CI_MODULE_READY; + av7110->ci_slot[slot_num].flags |= CA_CI_MODULE_READY; break; } break; @@ -264,15 +270,19 @@ static int dvb_ca_ioctl(struct file *file, unsigned int cmd, void *parg) case CA_GET_SLOT_INFO: { struct ca_slot_info *info=(struct ca_slot_info *)parg; + unsigned int slot_num;

if (info->num < 0 || info->num > 1) { mutex_unlock(&av7110->ioctl_mutex); return -EINVAL; } - av7110->ci_slot[info->num].num = info->num; - av7110->ci_slot[info->num].type = FW_CI_LL_SUPPORT(av7110->arm_app) ? - CA_CI_LINK : CA_CI; - memcpy(info, &av7110->ci_slot[info->num], sizeof(struct ca_slot_info)); + slot_num = array_index_nospec(info->num, MAX_CI_SLOTS); + + av7110->ci_slot[slot_num].num = info->num; + av7110->ci_slot[slot_num].type = FW_CI_LL_SUPPORT(av7110->arm_app) ? + CA_CI_LINK : CA_CI; + memcpy(info, &av7110->ci_slot[slot_num], + sizeof(struct ca_slot_info)); break; }