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| author | Richard Genoud <richard.genoud@gmail.com> | 2013-08-19 20:30:31 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-08-19 20:47:27 +0400 |
| commit | 94fc5d9de5bd757ad46f0d94bc4ebf617c4487f6 (patch) | |
| tree | 84cc97ed83166e4d9f074dc3d47ba301579f34bf | |
| parent | d6a5e06cd17a3f901231e345e4acc1c3dab9fbb8 (diff) | |
| download | linux-94fc5d9de5bd757ad46f0d94bc4ebf617c4487f6.tar.xz | |
proc: return on proc_readdir error
Commit f0c3b5093add ("[readdir] convert procfs") introduced a bug on the
listing of the proc file-system. The return value of proc_readdir()
isn't tested anymore in the proc_root_readdir function.
This lead to an "interesting" behaviour when we are using the getdents()
system call with a buffer too small: instead of failing, it returns the
first entries of /proc (enough to fill the given buffer), plus the PID
directories.
This is not triggered on glibc (as getdents is called with a 32KB
buffer), but on uclibc, the buffer size is only 1KB, thus some proc
entries are missing.
See https://lkml.org/lkml/2013/8/12/288 for more background.
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/proc/root.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c index 229e366598da..e0a790da726d 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -205,7 +205,9 @@ static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentr static int proc_root_readdir(struct file *file, struct dir_context *ctx) { if (ctx->pos < FIRST_PROCESS_ENTRY) { - proc_readdir(file, ctx); + int error = proc_readdir(file, ctx); + if (unlikely(error <= 0)) + return error; ctx->pos = FIRST_PROCESS_ENTRY; } |