fs/xattr.c:setxattr(): improve handling of allocation failures
This allocation can be as large as 64k.
- Add __GFP_NOWARN so the a falied kmalloc() is silent
- Fall back to vmalloc() if the kmalloc() failed
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: David Rientjes <rientjes@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/xattr.c b/fs/xattr.c
index d14afba..3c8c1cc 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -321,6 +321,7 @@
{
int error;
void *kvalue = NULL;
+ void *vvalue = NULL; /* If non-NULL, we used vmalloc() */
char kname[XATTR_NAME_MAX + 1];
if (flags & ~(XATTR_CREATE|XATTR_REPLACE))
@@ -335,13 +336,25 @@
if (size) {
if (size > XATTR_SIZE_MAX)
return -E2BIG;
- kvalue = memdup_user(value, size);
- if (IS_ERR(kvalue))
- return PTR_ERR(kvalue);
+ kvalue = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
+ if (!kvalue) {
+ vvalue = vmalloc(size);
+ if (!vvalue)
+ return -ENOMEM;
+ kvalue = vvalue;
+ }
+ if (copy_from_user(kvalue, value, size)) {
+ error = -EFAULT;
+ goto out;
+ }
}
error = vfs_setxattr(d, kname, kvalue, size, flags);
- kfree(kvalue);
+out:
+ if (vvalue)
+ vfree(vvalue);
+ else
+ kfree(kvalue);
return error;
}