cifs: fix integer overflow in match_server()

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commit 2510859475 upstream.

The echo_interval is not limited in any way during mounting,
which makes it possible to write a large number to it. This can
cause an overflow when multiplying ctx->echo_interval by HZ in
match_server().

Add constraints for echo_interval to smb3_fs_context_parse_param().

Found by Linux Verification Center (linuxtesting.org) with Svace.

Fixes: adfeb3e00e ("cifs: Make echo interval tunable")
Cc: stable@vger.kernel.org
Signed-off-by: Roman Smirnov <r.smirnov@omp.ru>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Roman Smirnov 2025-03-31 11:22:49 +03:00 • committed by Greg Kroah-Hartman

parent b2a1833e1c

commit 3db0ca61cb

1 changed files with 5 additions and 0 deletions

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fs/smb/client/fs_context.c

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