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fs: dlm: add get buffer error handling

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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>
This commit is contained in:
Alexander Aring 2020-11-02 20:04:18 -05:00 committed by David Teigland
parent 9f8f9c774a
commit 692f51c8cb
1 changed files with 6 additions and 0 deletions
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6
fs/dlm/lowcomms.c
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@ -1352,6 +1352,12 @@ void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc)
struct writequeue_entry *e; struct writequeue_entry *e;
int offset = 0; 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); con = nodeid2con(nodeid, allocation);
if (!con) if (!con)
return NULL; return NULL;