From: Simon Horman horms@kernel.org

stable inclusion from stable-v5.10.227 commit e2b2558971e02ca33eb637a8350d68a48b3e8e46 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYRA6 CVE: CVE-2024-49995

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 6555a2a9212be6983d2319d65276484f7c5f431a ]

Smatch reports that copying media_name and if_name to name_parts may overwrite the destination.

.../bearer.c:166 bearer_name_validate() error: strcpy() 'media_name' too large for 'name_parts->media_name' (32 vs 16) .../bearer.c:167 bearer_name_validate() error: strcpy() 'if_name' too large for 'name_parts->if_name' (1010102 vs 16)

This does seem to be the case so guard against this possibility by using strscpy() and failing if truncation occurs.

Introduced by commit b97bf3fd8f6a ("[TIPC] Initial merge")

Compile tested only.

Reviewed-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Simon Horman horms@kernel.org Link: https://patch.msgid.link/20240801-tipic-overrun-v2-1-c5b869d1f074@kernel.org Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: dinglongwei dinglongwei1@huawei.com --- net/tipc/bearer.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index 2511718b8f3f..69dfb0431008 100644 --- a/net/tipc/bearer.c +++ b/net/tipc/bearer.c @@ -161,8 +161,12 @@ static int bearer_name_validate(const char *name,

/* return bearer name components, if necessary */ if (name_parts) { - strcpy(name_parts->media_name, media_name); - strcpy(name_parts->if_name, if_name); + if (strscpy(name_parts->media_name, media_name, + TIPC_MAX_MEDIA_NAME) < 0) + return 0; + if (strscpy(name_parts->if_name, if_name, + TIPC_MAX_IF_NAME) < 0) + return 0; } return 1; }