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fprobe: Fix to ensure the number of active retprobes is not zero 

The number of active retprobes can be zero but it is not acceptable,
so return EINVAL error if detected.

Link: https://lore.kernel.org/all/169750018550.186853.11198884812017796410.stgit@devnote2/

Reported-by: wuqiang.matt <wuqiang.matt@bytedance.com>
Closes: https://lore.kernel.org/all/20231016222103.cb9f426edc60220eabd8aa6a@kernel.org/
Fixes: 5b0ab78998 ("fprobe: Add exit_handler support")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Masami Hiramatsu (Google) 2023-10-17 08:49:45 +09:00
parent 2a86ac30a6
commit 700b2b4397
1 changed files with 3 additions and 3 deletions
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6
kernel/trace/fprobe.c
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@ -189,7 +189,7 @@ static int fprobe_init_rethook(struct fprobe *fp, int num)
{
int i, size;
if (num < 0)
if (num <= 0)
return -EINVAL;
if (!fp->exit_handler) {
@ -202,8 +202,8 @@ static int fprobe_init_rethook(struct fprobe *fp, int num)
size = fp->nr_maxactive;
else
size = num * num_possible_cpus() * 2;
if (size < 0)
return -E2BIG;
if (size <= 0)
return -EINVAL;
fp->rethook = rethook_alloc((void *)fp, fprobe_exit_handler);
if (!fp->rethook)