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| author | Yue Hu <huyue2@yulong.com> | 2019-01-31 18:12:46 +0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2019-02-12 12:09:49 -0800 |
| commit | 4c6c4d34536744f2c9e171ef5bb548a06a525501 (patch) | |
| tree | b796fdf12b0b4b29b9490dd157c6e40a2f8cd92a /fs/pstore | |
| parent | 182ca6e0ae23550cf98d05daeab8dcb7fdc0a928 (diff) | |
| download | linux-4c6c4d34536744f2c9e171ef5bb548a06a525501.tar.gz linux-4c6c4d34536744f2c9e171ef5bb548a06a525501.tar.bz2 linux-4c6c4d34536744f2c9e171ef5bb548a06a525501.zip | |
pstore: Avoid writing records with zero size
Sometimes pstore_console_write() will write records with zero size
to persistent ram zone, which is unnecessary. It will only increase
resource consumption. Also adjust ramoops_write_kmsg_hdr() to have
same logic if memory allocation fails.
Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs/pstore')
| -rw-r--r-- | fs/pstore/platform.c | 3 | ||||
| -rw-r--r-- | fs/pstore/ram.c | 6 |
2 files changed, 7 insertions, 2 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 2d1066ed3c28..75887a269b64 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -501,6 +501,9 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) { struct pstore_record record; + if (!c) + return; + pstore_record_init(&record, psinfo); record.type = PSTORE_TYPE_CONSOLE; diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index 1adb5e35c004..b2471d430048 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -352,8 +352,10 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, (time64_t)record->time.tv_sec, record->time.tv_nsec / 1000, record->compressed ? 'C' : 'D'); - WARN_ON_ONCE(!hdr); - len = hdr ? strlen(hdr) : 0; + if (WARN_ON_ONCE(!hdr)) + return 0; + + len = strlen(hdr); persistent_ram_write(prz, hdr, len); kfree(hdr); |