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x86: fix seq_file iteration for pat/memtype.c 

The memtype seq_file iterator allocates a buffer in the ->start and ->next
functions and frees it in the ->show function.  The preferred handling for
such resources is to free them in the subsequent ->next or ->stop function
call.

Since Commit 1f4aace60b ("fs/seq_file.c: simplify seq_file iteration
code and interface") there is no guarantee that ->show will be called
after ->next, so this function can now leak memory.

So move the freeing of the buffer to ->next and ->stop.

Link: https://lkml.kernel.org/r/161248539022.21478.13874455485854739066.stgit@noble1
Fixes: 1f4aace60b ("fs/seq_file.c: simplify seq_file iteration code and interface")
Signed-off-by: NeilBrown <neilb@suse.de>
Cc: Xin Long <lucien.xin@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
NeilBrown 2021-02-25 17:22:29 -08:00 committed by Linus Torvalds
parent b3656d8227
commit 3d2fc4c082
1 changed files with 2 additions and 2 deletions
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4
arch/x86/mm/pat/memtype.c
View File

@ -1164,12 +1164,14 @@ static void *memtype_seq_start(struct seq_file *seq, loff_t *pos)
static void *memtype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
kfree(v);
++*pos;
return memtype_get_idx(*pos);
}
static void memtype_seq_stop(struct seq_file *seq, void *v)
{
kfree(v);
}
static int memtype_seq_show(struct seq_file *seq, void *v)
@ -1181,8 +1183,6 @@ static int memtype_seq_show(struct seq_file *seq, void *v)
entry_print->end,
cattr_name(entry_print->type));
kfree(entry_print);
return 0;
}