From: Florin Malita <fmalita@gmail.com>
Date: Sun, 25 Jun 2006 12:48:31 +0000 (-0700)
Subject: [PATCH] 9pfs: missing result check in v9fs_vfs_readlink() and v9fs_vfs_link()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0710d36a0fd5db3176369397f0fc49db32a63507;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] 9pfs: missing result check in v9fs_vfs_readlink() and v9fs_vfs_link()

__getname() may fail and return NULL (as pointed out by Coverity 437 &
1220).

Signed-off-by: Florin Malita <fmalita@gmail.com>
Acked-by: Eric Van Hensbergen <ericvh@gmail.com>
Cc: <rminnich@lanl.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 2cb87ba4b1c1..8e60dc7ec4a6 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1054,6 +1054,9 @@ static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
 	int ret;
 	char *link = __getname();
 
+	if (unlikely(!link))
+		return -ENOMEM;
+
 	if (buflen > PATH_MAX)
 		buflen = PATH_MAX;
 
@@ -1227,6 +1230,9 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
 	}
 
 	name = __getname();
+	if (unlikely(!name))
+		return -ENOMEM;
+
 	sprintf(name, "%d\n", oldfid->fid);
 	retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
 	__putname(name);