Commit 03514685 authored by Duane Griffin's avatar Duane Griffin Committed by Al Viro

vfs: introduce helper function to safely NUL-terminate symlinks

A number of filesystems were potentially triggering kernel bugs due to
corrupted symlink names on disk. This function helps safely terminate
the names.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarDuane Griffin <duaneg@dghda.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent a17d5232
...@@ -94,4 +94,9 @@ static inline char *nd_get_link(struct nameidata *nd) ...@@ -94,4 +94,9 @@ static inline char *nd_get_link(struct nameidata *nd)
return nd->saved_names[nd->depth]; return nd->saved_names[nd->depth];
} }
static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
{
((char *) name)[min(len, maxlen)] = '\0';
}
#endif /* _LINUX_NAMEI_H */ #endif /* _LINUX_NAMEI_H */
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