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tipc: guard against string buffer overrun

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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>
This commit is contained in:
Simon Horman 2024-08-01 19:35:37 +01:00 • committed by Ksawlii
parent a4416212c2
commit ff9d241811
1 changed files with 6 additions and 2 deletions
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8
net/tipc/bearer.c
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@ -161,8 +161,12 @@ static int bearer_name_validate(const char *name,
/* return bearer name components, if necessary */ /* return bearer name components, if necessary */
if (name_parts) { if (name_parts) {
strcpy(name_parts->media_name, media_name); if (strscpy(name_parts->media_name, media_name,
strcpy(name_parts->if_name, if_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; return 1;
} }