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fs/9p: avoid debug OOPS when reading a long symlink 

Reading a symlink longer than the given buffer, a p9_debug use would
try to print the link name (not NUL-terminated) using a %s format.
Use %.*s instead, and replace the strncpy+strnlen with functionally
equivalent strlen+memcpy.

Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Jim Meyering 2012-08-21 09:20:49 +02:00 committed by Eric Van Hensbergen
parent 4cbe5a555f
commit ba413ab2cc
1 changed files with 4 additions and 4 deletions
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8
fs/9p/vfs_inode.c
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@ -1276,12 +1276,12 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
}
/* copy extension buffer into buffer */
strncpy(buffer, st->extension, buflen);
retval = min(strlen(st->extension)+1, (size_t)buflen);
memcpy(buffer, st->extension, retval);
p9_debug(P9_DEBUG_VFS, "%s -> %s (%s)\n",
dentry->d_name.name, st->extension, buffer);
p9_debug(P9_DEBUG_VFS, "%s -> %s (%.*s)\n",
dentry->d_name.name, st->extension, buflen, buffer);
retval = strnlen(buffer, buflen);
done:
p9stat_free(st);
kfree(st);