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A small fixup for the persistent storage subsystem. The bug can prevent 

kernel booting on a APEI-enabled machines w/ CONFIG_PSTORE_CONSOLE=y (this
 is N by default, though).
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Merge tag 'for-v3.7-fixes' of git://git.infradead.org/users/cbou/linux-pstore

Pull pstore fix from Anton Vorontsov:
 "A small fixup for the persistent storage subsystem.  The bug can
  prevent kernel booting on a APEI-enabled machines w/ PSTORE_CONSOLE=y
  (this is N by default, though)."

* tag 'for-v3.7-fixes' of git://git.infradead.org/users/cbou/linux-pstore:
  pstore: Fix NULL pointer dereference in console writes
This commit is contained in:
Linus Torvalds 2012-11-15 11:27:53 -08:00
parent e8017454ff 70a6f46d7b
commit 006b956807
1 changed files with 2 additions and 1 deletions
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3
fs/pstore/platform.c
View File

@ -161,6 +161,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
while (s < e) {
unsigned long flags;
u64 id;
if (c > psinfo->bufsize)
c = psinfo->bufsize;
@ -172,7 +173,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
spin_lock_irqsave(&psinfo->buf_lock, flags);
}
memcpy(psinfo->buf, s, c);
psinfo->write(PSTORE_TYPE_CONSOLE, 0, NULL, 0, c, psinfo);
psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, c, psinfo);
spin_unlock_irqrestore(&psinfo->buf_lock, flags);
s += c;
c = e - s;