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| author | Anton Ivanov <anton.ivanov@cambridgegreys.com> | 2020-11-13 13:26:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-30 13:54:17 +0300 |
| commit | c4b425322134e2ee2950bc1ca54a66511a1526a9 (patch) | |
| tree | f9017f6caee1950b456d55501e1ad974eca905dc | |
| parent | 0f2206e3d90a9f131b8cfc3f7629c698aa625ce4 (diff) | |
| download | linux-c4b425322134e2ee2950bc1ca54a66511a1526a9.tar.xz | |
um: Remove use of asprinf in umid.c
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@vger.kernel.org
Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/um/os-Linux/umid.c | 17 |
1 files changed, 5 insertions, 12 deletions
diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c index 1d7558dac75f..a3dd61521d24 100644 --- 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 *dir) { 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; - - filelen = strlen(file); + file = malloc(filelen); + if (!file) + return -ENOMEM; - 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); |