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pstore: Don't warn if data is uncompressed and type is not PSTORE_TYPE_DMESG

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commit 9abdcccc3d ("pstore: Extract common arguments into structure")
moved record decompression to function. decompress_record() gets
called without checking type and compressed flag. Warning will be
reported if data is uncompressed. Pstore type PSTORE_TYPE_PPC_OPAL,
PSTORE_TYPE_PPC_COMMON doesn't contain compressed data and warning get
printed part of dmesg.

Partial dmesg log:
[   35.848914] pstore: ignored compressed record type 6
[   35.848927] pstore: ignored compressed record type 8

Above warning should not get printed as it is known that data won't be
compressed for above type and it is valid condition.

This patch returns if data is not compressed and print warning only if
data is compressed and type is not PSTORE_TYPE_DMESG.

Reported-by: Anton Blanchard <anton@au1.ibm.com>
Signed-off-by: Ankit Kumar <ankit@linux.vnet.ibm.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Fixes: 9abdcccc3d ("pstore: Extract common arguments into structure")
Cc: stable@vger.kernel.org
This commit is contained in:
Ankit Kumar 2017-05-23 11:16:52 +05:30 committed by Kees Cook
parent 5ed02dbb49
commit 4a16d1cb24
1 changed files with 4 additions and 1 deletions
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5
fs/pstore/platform.c
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@ -770,8 +770,11 @@ static void decompress_record(struct pstore_record *record)
int unzipped_len;
char *decompressed;
if (!record->compressed)
return;
/* Only PSTORE_TYPE_DMESG support compression. */
if (!record->compressed || record->type != PSTORE_TYPE_DMESG) {
if (record->type != PSTORE_TYPE_DMESG) {
pr_warn("ignored compressed record type %d\n", record->type);
return;
}