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=...

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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 */