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| author | Al Viro <viro@zeniv.linux.org.uk> | 2014-01-26 21:37:55 +0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-01-26 21:37:55 +0400 |
| commit | f6500801522c61782d4990fa1ad96154cb397cd4 (patch) | |
| tree | 681441a4ea0e816d49145c89c63645c677d12ce1 /fs | |
| parent | a8323da0366d3398eda62741d2ac1130c8a172ed (diff) | |
| download | linux-f6500801522c61782d4990fa1ad96154cb397cd4.tar.xz | |
__dentry_path() fixes
* we need to save the starting point for restarts
* reject pathologically short buffers outright
Spotted-by: Denys Vlasenko <dvlasenk@redhat.com>
Spotted-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/dcache.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index fdbe23027810..265e0ce9769c 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -3116,19 +3116,22 @@ char *simple_dname(struct dentry *dentry, char *buffer, int buflen) /* * Write full pathname from the root of the filesystem into the buffer. */ -static char *__dentry_path(struct dentry *dentry, char *buf, int buflen) +static char *__dentry_path(struct dentry *d, char *buf, int buflen) { + struct dentry *dentry; char *end, *retval; int len, seq = 0; int error = 0; + if (buflen < 2) + goto Elong; + rcu_read_lock(); restart: + dentry = d; end = buf + buflen; len = buflen; prepend(&end, &len, "\0", 1); - if (buflen < 1) - goto Elong; /* Get '/' right */ retval = end-1; *retval = '/'; |