[PATCH 5.10 620/717] um: Remove use of asprinf in umid.c

[Greg Kroah-Hartman]

From: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>

commit 97be7ceaf7fea68104824b6aa874cff235333ac1 upstream.

asprintf is not compatible with the existing uml memory allocation
mechanism. Its use on the "user" side of UML results in a corrupt slab
state.

Fixes: 0d4e5ac7e780 ("um: remove uses of variable length arrays")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/um/os-Linux/umid.c |   17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

--- a/arch/um/os-Linux/umid.c
+++ b/arch/um/os-Linux/umid.c
@@ -137,20 +137,13 @@ static inline int is_umdir_used(char *di
 {
 	char pid[sizeof("nnnnnnnnn")], *end, *file;
 	int dead, fd, p, n, err;
-	size_t filelen;
+	size_t filelen = strlen(dir) + sizeof("/pid") + 1;
 
-	err = asprintf(&file, "%s/pid", dir);
-	if (err < 0)
-		return 0;
+	file = malloc(filelen);
+	if (!file)
+		return -ENOMEM;
 
-	filelen = strlen(file);
-
-	n = snprintf(file, filelen, "%s/pid", dir);
-	if (n >= filelen) {
-		printk(UM_KERN_ERR "is_umdir_used - pid filename too long\n");
-		err = -E2BIG;
-		goto out;
-	}
+	snprintf(file, filelen, "%s/pid", dir);
 
 	dead = 0;
 	fd = open(file, O_RDONLY);