Commit 5702222c9a7a ("Input: joydev - use memdup_user() to duplicate
memory from user-space") changed the kmalloc() and copy_from_user()
with a single call to memdup_user() but wrongly used the same error
path than the old code in which the buffer allocated by kmalloc() was
freed if copy_from_user() failed.
This is of course wrong since if memdup_user() fails, no memory was
allocated and the error in the error-valued pointer should be returned.
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>
Fixes: 5702222c9a7a ("Input: joydev - use memdup_user() to duplicate
memory from user-space")
---
drivers/input/joydev.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
index e3dcd4abae18..5d11fea3c8ec 100644
--- a/drivers/input/joydev.c
+++ b/drivers/input/joydev.c
@@ -445,10 +445,8 @@ static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
/* Validate the map. */
abspam = memdup_user(argp, len);
- if (IS_ERR(abspam)) {
- retval = PTR_ERR(abspam);
- goto out;
- }
+ if (IS_ERR(abspam))
+ return PTR_ERR(abspam);
for (i = 0; i < joydev->nabs; i++) {
if (abspam[i] > ABS_MAX) {
@@ -478,10 +476,8 @@ static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
/* Validate the map. */
keypam = memdup_user(argp, len);
- if (IS_ERR(keypam)) {
- retval = PTR_ERR(keypam);
- goto out;
- }
+ if (IS_ERR(keypam))
+ return PTR_ERR(keypam);
for (i = 0; i < joydev->nkey; i++) {
if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
--
2.4.3
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