From: Matt Fleming <matt.fleming@xxxxxxxxx> Delete the following expression, data->off = ps->size % REC_SIZE; as it is not reasonable to expect users to allocate an exact multiple of REC_SIZE because that constant isn't exported outside of fs/pstore. There are already checks in the ftrace code to ensure that no accesses happen beyond the bounds of the buffer, so there's no real reason to skip the beginning of the data buffer. It's likely this hasn't been caught before because this code mainly runs under ARM where REC_SIZE is 8 bytes. On x86-64 REC_SIZE is 24 bytes and so it's more likely that ps->size isn't going to be a multiple. Cc: Anton Vorontsov <anton@xxxxxxxxxx> Cc: Colin Cross <ccross@xxxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Tony Luck <tony.luck@xxxxxxxxx> Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx> --- fs/pstore/inode.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c index 71bf5f4..cc6ec0e 100644 --- a/fs/pstore/inode.c +++ b/fs/pstore/inode.c @@ -71,7 +71,6 @@ static void *pstore_ftrace_seq_start(struct seq_file *s, loff_t *pos) if (!data) return NULL; - data->off = ps->size % REC_SIZE; data->off += *pos * REC_SIZE; if (data->off + REC_SIZE > ps->size) { kfree(data); -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html