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pstore: Move record decompression to function

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This moves the record decompression logic out to a separate function
to avoid the deep indentation.

Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2017-03-03 17:35:25 -08:00
parent 9abdcccc3d
commit 634f8f5167
1 changed files with 36 additions and 29 deletions
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63
fs/pstore/platform.c
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@ -757,6 +757,37 @@ void pstore_unregister(struct pstore_info *psi)
}
EXPORT_SYMBOL_GPL(pstore_unregister);
static void decompress_record(struct pstore_record *record)
{
int unzipped_len;
/* Only PSTORE_TYPE_DMESG support compression. */
if (!record->compressed || record->type != PSTORE_TYPE_DMESG) {
pr_warn("ignored compressed record type %d\n", record->type);
return;
}
/* No compression method has created the common buffer. */
if (!big_oops_buf) {
pr_warn("no decompression buffer allocated\n");
return;
}
unzipped_len = pstore_decompress(record->buf, big_oops_buf,
record->size, big_oops_buf_sz);
if (unzipped_len > 0) {
if (record->ecc_notice_size)
memcpy(big_oops_buf + unzipped_len,
record->buf + record->size,
record->ecc_notice_size);
kfree(record->buf);
record->buf = big_oops_buf;
record->size = unzipped_len;
record->compressed = false;
} else
pr_err("decompression failed: %d\n", unzipped_len);
}
/*
* Read all the records from the persistent store. Create
* files in our filesystem. Don't warn about -EEXIST errors
@ -768,7 +799,6 @@ void pstore_get_records(int quiet)
struct pstore_info *psi = psinfo;
struct pstore_record record = { .psi = psi, };
int failed = 0, rc;
int unzipped_len = -1;
if (!psi)
return;
@ -782,41 +812,18 @@ void pstore_get_records(int quiet)
&record.buf, &record.compressed,
&record.ecc_notice_size,
record.psi)) > 0) {
if (record.compressed &&
record.type == PSTORE_TYPE_DMESG) {
if (big_oops_buf)
unzipped_len = pstore_decompress(
record.buf,
big_oops_buf,
record.size,
big_oops_buf_sz);
if (unzipped_len > 0) {
if (record.ecc_notice_size)
memcpy(big_oops_buf + unzipped_len,
record.buf + record.size,
record.ecc_notice_size);
kfree(record.buf);
record.buf = big_oops_buf;
record.size = unzipped_len;
record.compressed = false;
} else {
pr_err("decompression failed;returned %d\n",
unzipped_len);
record.compressed = true;
}
}
decompress_record(&record);
rc = pstore_mkfile(record.type, psi->name, record.id,
record.count, record.buf,
record.compressed,
record.size + record.ecc_notice_size,
record.time, record.psi);
if (unzipped_len < 0) {
/* Free buffer other than big oops */
if (record.buf != big_oops_buf)
kfree(record.buf);
record.buf = NULL;
} else
unzipped_len = -1;
if (rc && (rc != -EEXIST || !quiet))
failed++;