From: Huang Yiwei <hyi...@codeaurora.org>
In a scenario of panic, when we use DRAM to store log instead
of persistant storage and during warm reset when we copy these
data outside of ram. Missing check on prz->start(write position)
can cause crash because it can be any value and can point outside
the mapped region. So add the start check to avoid.
Signed-off-by: Huang Yiwei <hyi...@codeaurora.org>
Signed-off-by: Mukesh Ojha <mo...@codeaurora.org>
---
change in v2:
- this is on top of first patchset.
fs/pstore/ram_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 0da012f..a15748a 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -514,7 +514,7 @@ static int persistent_ram_post_init(struct
persistent_ram_zone *prz, u32 sig,
sig ^= PERSISTENT_RAM_SIG;
if (prz->buffer->sig == sig) {
- if (buffer_size(prz) == 0) {
+ if (buffer_size(prz) == 0 && buffer_start(prz) == 0) {
pr_debug("found existing empty buffer\n");
return 0;
}
--
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