This is another instance of incorrect use of list iterator and
checking it for NULL.
The list iterator value 'map' will *always* be set and non-NULL
by list_for_each_entry(), so it is incorrect to assume that the
iterator value will be NULL if the list is empty (in this case, the
check 'if (!map) {' will always be false and never exit as expected).
To fix the bug, use a new variable 'iter' as the list iterator,
while use the original variable 'map' as a dedicated pointer to
point to the found element.
Without this patch, Kernel crashes with below trace:
Unable to handle kernel access to user memory outside uaccess routines
at virtual address 0000ffff7fb03750
...
Call trace:
fastrpc_map_create+0x70/0x290 [fastrpc]
fastrpc_req_mem_map+0xf0/0x2dc [fastrpc]
fastrpc_device_ioctl+0x138/0xc60 [fastrpc]
__arm64_sys_ioctl+0xa8/0xec
invoke_syscall+0x48/0x114
el0_svc_common.constprop.0+0xd4/0xfc
do_el0_svc+0x28/0x90
el0_svc+0x3c/0x130
el0t_64_sync_handler+0xa4/0x130
el0t_64_sync+0x18c/0x190
Code: 14000016 f94000a5 eb05029f 54000260 (b94018a6)
---[ end trace 0000000000000000 ]---
Cc: stable(a)vger.kernel.org
Fixes: 5c1b97c7d7b7 ("misc: fastrpc: add support for FASTRPC_IOCTL_MEM_MAP/UNMAP")
Reported-by: Jan Jablonsky <jjablonsky(a)snapchat.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla(a)linaro.org>
---
drivers/misc/fastrpc.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 4bdc8e0df657..93ebd174d848 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1748,17 +1748,18 @@ static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
static int fastrpc_req_mem_unmap_impl(struct fastrpc_user *fl, struct fastrpc_mem_unmap *req)
{
struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
- struct fastrpc_map *map = NULL, *m;
+ struct fastrpc_map *map = NULL, *iter, *m;
struct fastrpc_mem_unmap_req_msg req_msg = { 0 };
int err = 0;
u32 sc;
struct device *dev = fl->sctx->dev;
spin_lock(&fl->lock);
- list_for_each_entry_safe(map, m, &fl->maps, node) {
- if ((req->fd < 0 || map->fd == req->fd) && (map->raddr == req->vaddr))
+ list_for_each_entry_safe(iter, m, &fl->maps, node) {
+ if ((req->fd < 0 || iter->fd == req->fd) && (iter->raddr == req->vaddr)) {
+ map = iter;
break;
- map = NULL;
+ }
}
spin_unlock(&fl->lock);
--
2.21.0
TEST_GEN_FILES contains files that are generated during compilation and are
required to be included together with the test binaries, e.g. when
performing:
make -C tools/testing/selftests install INSTALL_PATH=/some/other/path [*]
Add test_encl.elf to TEST_GEN_FILES because otherwise the installed test
binary will fail to run.
[*] https://docs.kernel.org/dev-tools/kselftest.html
Cc: stable(a)vger.kernel.org
Fixes: 2adcba79e69d ("selftests/x86: Add a selftest for SGX")
Signed-off-by: Jarkko Sakkinen <jarkko(a)kernel.org>
---
tools/testing/selftests/sgx/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/sgx/Makefile b/tools/testing/selftests/sgx/Makefile
index 75af864e07b6..f3f312904bcc 100644
--- a/tools/testing/selftests/sgx/Makefile
+++ b/tools/testing/selftests/sgx/Makefile
@@ -17,6 +17,7 @@ ENCL_CFLAGS := -Wall -Werror -static -nostdlib -nostartfiles -fPIC \
-fno-stack-protector -mrdrnd $(INCLUDES)
TEST_CUSTOM_PROGS := $(OUTPUT)/test_sgx
+TEST_GEN_FILES := $(OUTPUT)/test_encl.elf
ifeq ($(CAN_BUILD_X86_64), 1)
all: $(TEST_CUSTOM_PROGS) $(OUTPUT)/test_encl.elf
--
2.36.1