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staging: unisys: visorbus: Check controlvm message payload size

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Checks the controlvm message's payload size before copying it into a
parser_context struct's name region.

Signed-off-by: David Binder <david.binder@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Binder 2017-02-01 17:38:55 -05:00 • committed by Greg Kroah-Hartman
parent 0c773962cf
commit 308ee8aa1f
1 changed files with 4 additions and 0 deletions
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4
drivers/staging/unisys/visorbus/visorchipset.c
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@ -399,6 +399,10 @@ parser_name_get(struct parser_context *ctx)
struct spar_controlvm_parameters_header *phdr = NULL;
phdr = (struct spar_controlvm_parameters_header *)(ctx->data);
if (phdr->name_offset + phdr->name_length > ctx->param_bytes)
return NULL;
ctx->curr = ctx->data + phdr->name_offset;
ctx->bytes_remaining = phdr->name_length;
return parser_string_get(ctx);