Commit 0635170b authored by Adam B. Jerome's avatar Adam B. Jerome Committed by Linus Torvalds

[PATCH] /fs/proc/: 'larger than buffer size' memory accessed by clear_user()

Address a potential 'larger than buffer size' memory access by
clear_user().  Without this patch, this call to clear_user() can attempt to
clear too many (tsz) bytes resulting in a wrong (-EFAULT) return code by
read_kcore().
Signed-off-by: default avatarAdam B. Jerome <abj@novell.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 232ba9db
......@@ -382,7 +382,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
*/
if (n) {
if (clear_user(buffer + tsz - n,
tsz - n))
n))
return -EFAULT;
}
} else {
......
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