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orangefs: Avoid symlink upcall if target is too long.

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Previously the client-core detected this condition by sheer luck!

Since we used strncpy, no NUL byte would be included on the name. The
client-core would call strlen, which would read past the end of its
buffer, but return a number large enough that the client-core would
return ENAMETOOLONG.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Martin Brandenburg 2016-02-29 16:07:35 -05:00 committed by Mike Marshall
parent 162ada7764
commit c62da5853d
1 changed files with 3 additions and 0 deletions
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3
fs/orangefs/namei.c
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@ -269,6 +269,9 @@ static int orangefs_symlink(struct inode *dir,
if (!symname)
return -EINVAL;
if (strlen(symname)+1 > ORANGEFS_NAME_MAX)
return -ENAMETOOLONG;
new_op = op_alloc(ORANGEFS_VFS_OP_SYMLINK);
if (!new_op)
return -ENOMEM;