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printk: fix kmsg_dump_get_buffer length calulations

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[ Upstream commit 89ccf18f03 ]

kmsg_dump_get_buffer() uses @syslog to determine if the syslog
prefix should be written to the buffer. However, when calculating
the maximum number of records that can fit into the buffer, it
always counts the bytes from the syslog prefix.

Use @syslog when calculating the maximum number of records that can
fit into the buffer.

Fixes: e2ae715d66 ("kmsg - kmsg_dump() use iterator to receive log buffer content")
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210113164413.1599-1-john.ogness@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
John Ogness 2021-01-13 17:50:13 +01:06 committed by Greg Kroah-Hartman
parent cf3cca5f15
commit ce4d02da78
1 changed files with 2 additions and 2 deletions
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4
kernel/printk/printk.c
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@ -3376,7 +3376,7 @@ bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
while (prb_read_valid_info(prb, seq, &info, &line_count)) {
if (r.info->seq >= dumper->next_seq)
break;
l += get_record_print_text_size(&info, line_count, true, time);
l += get_record_print_text_size(&info, line_count, syslog, time);
seq = r.info->seq + 1;
}
@ -3386,7 +3386,7 @@ bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
&info, &line_count)) {
if (r.info->seq >= dumper->next_seq)
break;
l -= get_record_print_text_size(&info, line_count, true, time);
l -= get_record_print_text_size(&info, line_count, syslog, time);
seq = r.info->seq + 1;
}