From: Dan Carpenter <dan.carpenter@oracle.com> mainline inclusion from mainline-5.15-rc4 commit 87ffb310d5e8a441721a9d04dfa7c90cd9da3916 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I60T7G CVE: NA Reference: https://git.kernel.org/torvalds/linux/c/87ffb310d5e8 ------------------------------- The kmalloc() does not have a NULL check. This code can be re-written slightly cleaner to just use the kstrdup(). Fixes: 265fd1991c1d ("ksmbd: use LOOKUP_BENEATH to prevent the out of share access") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Namjae Jeon <linkinjeon@kernel.org> Acked-by: Hyunchul Lee <hyc.lee@gmail.com> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Jason Yan <yanaijie@huawei.com> Signed-off-by: Zhong Jinghua <zhongjinghua@huawei.com> --- fs/ksmbd/misc.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c index 6a19f4bc692d..60e7ac62c917 100644 --- a/fs/ksmbd/misc.c +++ b/fs/ksmbd/misc.c @@ -162,17 +162,14 @@ char *convert_to_nt_pathname(char *filename) { char *ab_pathname; - if (strlen(filename) == 0) { - ab_pathname = kmalloc(2, GFP_KERNEL); - ab_pathname[0] = '\\'; - ab_pathname[1] = '\0'; - } else { - ab_pathname = kstrdup(filename, GFP_KERNEL); - if (!ab_pathname) - return NULL; + if (strlen(filename) == 0) + filename = "\\"; - ksmbd_conv_path_to_windows(ab_pathname); - } + ab_pathname = kstrdup(filename, GFP_KERNEL); + if (!ab_pathname) + return NULL; + + ksmbd_conv_path_to_windows(ab_pathname); return ab_pathname; } -- 2.31.1