[PATCH AUTOSEL 4.19 38/50] pstore: fs superblock limits

[Sasha Levin]

From: Deepa Dinamani <deepa.kernel@xxxxxxxxx>

[ Upstream commit 83b8a3fbe3aa82ac3c253b698ae6a9be2dbdd5e0 ]

Leaving granularity at 1ns because it is dependent on the specific
attached backing pstore module. ramoops has microsecond resolution.

Fix the readback of ramoops fractional timestamp microseconds,
which has incorrectly been reporting the value as nanoseconds.

Fixes: 3f8f80f0cfeb ("pstore/ram: Read and write to the 'compressed' flag of pstore").

Signed-off-by: Deepa Dinamani <deepa.kernel@xxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Acked-by: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: anton@xxxxxxxxxx
Cc: ccross@xxxxxxxxxxx
Cc: keescook@xxxxxxxxxxxx
Cc: tony.luck@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/pstore/ram.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 316c16463b20f..015d74ee31a03 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -162,6 +162,7 @@ static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time,
 	if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n",
 		   (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type,
 		   &header_length) == 3) {
+		time->tv_nsec *= 1000;
 		if (data_type == 'C')
 			*compressed = true;
 		else
@@ -169,6 +170,7 @@ static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time,
 	} else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n",
 			  (time64_t *)&time->tv_sec, &time->tv_nsec,
 			  &header_length) == 2) {
+		time->tv_nsec *= 1000;
 		*compressed = false;
 	} else {
 		time->tv_sec = 0;
-- 
2.20.1