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efi-pstore: Fix an overflow on 32-bit builds

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commit 783ee43118 upstream.

In generic_id the long int timestamp is multiplied by 100000 and needs
an explicit cast to u64.

Without that the id in the resulting pstore filename is wrong and
userspace may have problems parsing it, but more importantly files in
pstore can never be deleted and may fill the EFI flash (brick device?).
This happens because when generic pstore code wants to delete a file,
it passes the id to the EFI backend which reinterpretes it and a wrong
variable name is attempted to be deleted.  There's no error message but
after remounting pstore, deleted files would reappear.

Signed-off-by: Andrew Zaborowski <andrew.zaborowski@intel.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
This commit is contained in:
Andrzej Zaborowski
2014-06-09 16:50:40 +02:00
committed by Jiri Slaby
parent cc6f6d1dfe
commit 8c23d6e199
1 changed files with 1 additions and 1 deletions
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2
drivers/firmware/efi/efi-pstore.c
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@@ -40,7 +40,7 @@ struct pstore_read_data {
static inline u64 generic_id(unsigned long timestamp,
unsigned int part, int count)
{
return (timestamp * 100 + part) * 1000 + count;
return ((u64) timestamp * 100 + part) * 1000 + count;
}
static int efi_pstore_read_func(struct efivar_entry *entry, void *data)