From: Yicong Yang <yangyic...@hisilicon.com>
[ Upstream commit 488dac0c9237647e9b8f788b6a342595bfa40bda ]
The attr->set() receive a value of u64, but simple_strtoll() is used for
doing the conversion. It will lead to the error cast if user inputs a
negative value.
Use kstrtoull() instead of simple_strtoll() to convert a string got from
the user to an unsigned value. The former will return '-EINVAL' if it
gets a negetive value, but the latter can't handle the situation
correctly. Make 'val' unsigned long long as what kstrtoull() takes,
this will eliminate the compile warning on no 64-bit architectures.
Fixes: f7b88631a897 ("fs/libfs.c: fix simple_attr_write() on 32bit machines")
Signed-off-by: Yicong Yang <yangyic...@hisilicon.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Cc: Al Viro <v...@zeniv.linux.org.uk>
Link:
https://lkml.kernel.org/r/1605341356-11872-1-git-send-email-yangyic...@hisilicon.com
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
fs/libfs.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/libfs.c b/fs/libfs.c
index a33e95f8729bf..01e9cae5b1601 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -827,7 +827,7 @@ ssize_t simple_attr_write(struct file *file, const char
__user *buf,
size_t len, loff_t *ppos)
{
struct simple_attr *attr;
- u64 val;
+ unsigned long long val;
size_t size;
ssize_t ret;
@@ -845,7 +845,9 @@ ssize_t simple_attr_write(struct file *file, const char
__user *buf,
goto out;
attr->set_buf[size] = '\0';
- val = simple_strtoll(attr->set_buf, NULL, 0);
+ ret = kstrtoull(attr->set_buf, 0, &val);
+ if (ret)
+ goto out;
ret = attr->set(attr->data, val);
if (ret == 0)
ret = len; /* on success, claim we got the whole input */
--
2.27.0
