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authorAlexander Aring <aahringo@redhat.com>2020-11-03 04:04:18 +0300
committerDavid Teigland <teigland@redhat.com>2020-11-10 21:14:20 +0300
commit692f51c8cbe752cb16ea2a75016ea0a497d00b1c (patch)
treea1a15ae76064d1f8ca5d0f8fff0c06e76bacd6e2 /fs/dlm
parent9f8f9c774ad10aa1c15952c36f580d7e3711a100 (diff)
downloadlinux-692f51c8cbe752cb16ea2a75016ea0a497d00b1c.tar.xz
fs: dlm: add get buffer error handling
This patch adds an error handling to the get buffer functionality if the user is requesting a buffer length which is more than possible of the internal buffer allocator. This should never happen because specific handling decided by compile time, but will warn if somebody forget about to handle this limitation right. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm')
-rw-r--r--fs/dlm/lowcomms.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 77382c2ce6da..620eca3979d5 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1352,6 +1352,12 @@ void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc)
struct writequeue_entry *e;
int offset = 0;
+ if (len > LOWCOMMS_MAX_TX_BUFFER_LEN) {
+ BUILD_BUG_ON(PAGE_SIZE < LOWCOMMS_MAX_TX_BUFFER_LEN);
+ log_print("failed to allocate a buffer of size %d", len);
+ return NULL;
+ }
+
con = nodeid2con(nodeid, allocation);
if (!con)
return NULL;