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authorMark Salyzyn <salyzyn@android.com>2015-01-14 01:32:50 +0300
committerTony Luck <tony.luck@intel.com>2015-01-17 02:47:23 +0300
commitf44f96528a8cd4134a4f2c1a9d8c785600aa4888 (patch)
treeb769fe914e0eab63f216244ec31ce9a95f974e07 /fs/pstore
parentff6bf6e8024f073ecea7dbf5c6afe6bd3872a569 (diff)
downloadlinux-f44f96528a8cd4134a4f2c1a9d8c785600aa4888.tar.xz
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>
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/ram.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 34ed8f860e23..6150e54eed30 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -164,6 +164,12 @@ static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
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,
int *count, struct timespec *time,
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,
cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1);
- if (!prz)
+ if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
1, id, type, PSTORE_TYPE_CONSOLE, 0);
- if (!prz)
+ if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
1, id, type, PSTORE_TYPE_FTRACE, 0);
- if (!prz)
+ if (!prz_ok(prz))
return 0;
if (!persistent_ram_old(prz))