From d410cd5303ec59c7cf23dd61423752ce8e9ecb59 Mon Sep 17 00:00:00 2001 From: Zhiling Zou Date: Fri, 24 Jul 2026 02:01:46 +0800 Subject: [PATCH] orangefs: skip leading spaces before parsing client debug masks orangefs_prepare_cdm_array() sizes each client debug keyword buffer with strcspn(cds_head, " "), but then parses the keyword with %s. The %s conversion skips leading whitespace, while strcspn() does not. If a client debug entry starts with a space, the allocation can be sized for an empty keyword while sscanf() copies the following non-empty token. This can write past the end of the allocated keyword buffer. Skip leading spaces before computing the keyword length so the allocation matches the string parsed by sscanf(). Fixes: f7be4ee07fb7 ("Orangefs: kernel client part 4") Cc: stable@vger.kernel.org Reported-by: Vega Assisted-by: Codex:gpt-5.4 Signed-off-by: Zhiling Zou Signed-off-by: Ren Wei Signed-off-by: Mike Marshall --- fs/orangefs/orangefs-debugfs.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/orangefs/orangefs-debugfs.c b/fs/orangefs/orangefs-debugfs.c index 69bd73a2b556..9f94919a6bc6 100644 --- a/fs/orangefs/orangefs-debugfs.c +++ b/fs/orangefs/orangefs-debugfs.c @@ -569,6 +569,7 @@ static int orangefs_prepare_cdm_array(char *debug_array_string) cds_delimiter = strchr(cds_head, '\n'); *cds_delimiter = '\0'; + cds_head = skip_spaces(cds_head); keyword_len = strcspn(cds_head, " "); cdm_array[i].keyword = kzalloc(keyword_len + 1, GFP_KERNEL);