pktgen: fix out-of-bounds access in pgctrl_write()

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If a privileged user writes an empty string to /proc/net/pktgen/pgctrl
the code for stripping the (then non-existent) '\n' actually writes the
zero byte at index -1 of data[]. The then still uninitialized array will
very likely fail the command matching tests and the pr_warning() at the
end will therefore leak stack bytes to the kernel log.

Fix those issues by simply ensuring we're passed a non-empty string as
the user API apparently expects a trailing '\n' for all commands.

Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Mathias Krause 2014-02-21 21:38:34 +01:00 • committed by David S. Miller

parent 8bfdfbc188

commit 20b0c718c3

1 changed files with 4 additions and 1 deletions

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net/core/pktgen.c

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