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authorAndrew Morton <akpm@linux-foundation.org>2012-04-05 14:25:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-05 15:25:50 -0700
commit44c824982fd37a578da23cc90885e9690a6a3f0e (patch)
treecc4180263258049e5b59fa019f6c686df2ff4caa
parent0d08d7b7e13b5060181b11ecdde82d8fda322123 (diff)
downloadop-kernel-dev-44c824982fd37a578da23cc90885e9690a6a3f0e.zip
op-kernel-dev-44c824982fd37a578da23cc90885e9690a6a3f0e.tar.gz
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>
-rw-r--r--fs/xattr.c21
1 files changed, 17 insertions, 4 deletions
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 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
{
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 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
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;
}
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