drm/modes: parse_cmdline: Fix possible reference past end of string

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Before this commit, if the last option of a video=... option is for
example "rotate" without a "=<value>" after it then delim will point to
the terminating 0 of the string, and value which is sets to <delim + 1>
will point one position past the end of the string.

This commit fixes this by enforcing that the contents of delim equals '='
as it should be for options which take a value, this check is done in a
new drm_mode_parse_cmdline_int helper function which factors out the
common integer parsing code for all the options which take an int.

Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-1-hdegoede@redhat.com

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This commit is contained in:

Hans de Goede 2019-11-18 16:51:22 +01:00

parent 49a37dc393

commit 8582e244e5

1 changed files with 30 additions and 38 deletions

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drivers/gpu/drm/drm_modes.c

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