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pstore: Handle zero-sized prz in series 

ramoops_pstore_read fails to return the next in a prz
series after first zero-sized entry, not venturing to
the next non-zero entry.

Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Mark Salyzyn 2015-01-13 14:32:50 -08:00 committed by Tony Luck
parent ff6bf6e802
commit f44f96528a
1 changed files with 9 additions and 3 deletions
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12
fs/pstore/ram.c
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@ -164,6 +164,12 @@ static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
return header_length; return header_length;
} }
static bool prz_ok(struct persistent_ram_zone *prz)
{
return !!prz && !!(persistent_ram_old_size(prz) +
persistent_ram_ecc_string(prz, NULL, 0));
}
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time, int *count, struct timespec *time,
char **buf, bool *compressed, char **buf, bool *compressed,
@ -178,13 +184,13 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
cxt->max_dump_cnt, id, type, cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1); PSTORE_TYPE_DMESG, 1);
if (!prz) if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
1, id, type, PSTORE_TYPE_CONSOLE, 0); 1, id, type, PSTORE_TYPE_CONSOLE, 0);
if (!prz) if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
1, id, type, PSTORE_TYPE_FTRACE, 0); 1, id, type, PSTORE_TYPE_FTRACE, 0);
if (!prz) if (!prz_ok(prz))
return 0; return 0;
if (!persistent_ram_old(prz)) if (!persistent_ram_old(prz))