From: Jim Cromie <jim.cromie@gmail.com> stable inclusion from stable-v4.19.314 commit 3c718bddddca9cbef177ac475b94c5c91147fb38 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9QGMG CVE: CVE-2024-35947 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 00e7d3bea2ce7dac7bee1cf501fb071fd0ea8f6c upstream. Fix a BUG_ON from 2009. Even if it looks "unreachable" (I didn't really look), lets make sure by removing it, doing pr_err and return -EINVAL instead. Cc: stable <stable@kernel.org> Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Link: https://lore.kernel.org/r/20240429193145.66543-2-jim.cromie@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- lib/dynamic_debug.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index dbf2b457e47e..dcb206c93e4f 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -243,7 +243,11 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords) } else { for (end = buf; *end && !isspace(*end); end++) ; - BUG_ON(end == buf); + if (end == buf) { + pr_err("parse err after word:%d=%s\n", nwords, + nwords ? words[nwords - 1] : "<none>"); + return -EINVAL; + } } /* `buf' is start of word, `end' is one past its end */ -- 2.17.1