6.6-stable review patch. If anyone has any objections, please let me know.
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From: Suraj Sonawane surajsonawane0215@gmail.com
[ Upstream commit 265e98f72bac6c41a4492d3e30a8e5fd22fe0779 ]
Fix an issue detected by syzbot with KASAN:
BUG: KASAN: vmalloc-out-of-bounds in cmd_to_func drivers/acpi/nfit/ core.c:416 [inline] BUG: KASAN: vmalloc-out-of-bounds in acpi_nfit_ctl+0x20e8/0x24a0 drivers/acpi/nfit/core.c:459
The issue occurs in cmd_to_func when the call_pkg->nd_reserved2 array is accessed without verifying that call_pkg points to a buffer that is appropriately sized as a struct nd_cmd_pkg. This can lead to out-of-bounds access and undefined behavior if the buffer does not have sufficient space.
To address this, a check was added in acpi_nfit_ctl() to ensure that buf is not NULL and that buf_len is less than sizeof(*call_pkg) before accessing it. This ensures safe access to the members of call_pkg, including the nd_reserved2 array.
Reported-by: syzbot+7534f060ebda6b8b51b3@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=7534f060ebda6b8b51b3 Tested-by: syzbot+7534f060ebda6b8b51b3@syzkaller.appspotmail.com Fixes: ebe9f6f19d80 ("acpi/nfit: Fix bus command validation") Signed-off-by: Suraj Sonawane surajsonawane0215@gmail.com Reviewed-by: Alison Schofield alison.schofield@intel.com Reviewed-by: Dave Jiang dave.jiang@intel.com Link: https://patch.msgid.link/20241118162609.29063-1-surajsonawane0215@gmail.com Signed-off-by: Ira Weiny ira.weiny@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/nfit/core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 7d88db451cfb..7918923e3b74 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -454,8 +454,13 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, if (cmd_rc) *cmd_rc = -EINVAL;
- if (cmd == ND_CMD_CALL) + if (cmd == ND_CMD_CALL) { + if (!buf || buf_len < sizeof(*call_pkg)) + return -EINVAL; + call_pkg = buf; + } + func = cmd_to_func(nfit_mem, cmd, call_pkg, &family); if (func < 0) return func;