[PATCH next] exec: Fix a NULL vs IS_ERR() test in bprm_add_fixup_comm()

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

The strndup_user() function doesn't return NULL, it returns error
pointers.  Fix the check to match.

Fixes: 7bdc6fc85c9a ("exec: fix up /proc/pid/comm in the execveat(AT_EMPTY_PATH) case")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 fs/exec.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index 7e24d585915e..c5c291502dca 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1512,10 +1512,10 @@ static int bprm_add_fixup_comm(struct linux_binprm *bprm,
 		return 0;
 
 	bprm->argv0 = strndup_user(p, MAX_ARG_STRLEN);
-	if (bprm->argv0)
-		return 0;
+	if (IS_ERR(bprm->argv0))
+		return PTR_ERR(bprm->argv0);
 
-	return -EFAULT;
+	return 0;
 }
 
 static struct linux_binprm *alloc_bprm(int fd, struct filename *filename, int flags)
-- 
2.45.2