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cbfs: Check return value of map() for error

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The CBFS core checks the result of a media->map() operation in multiple
places for CBFS_MEDIA_INVALID_MAP_ADDRESS, suggesting that this is a
valid response. However, it ironically fails to do so when actually
mapping the CBFS file itself, which can fail on buffer-constrained
systems since the size is much larger than when mapping metadata. This
patch adds a check with an error message and a NULL pointer return for
that case to make it easier to understand this condition.

BUG=None
TEST=None

Change-Id: Icae3dd20d3d111cdfc4f2dc6397b52174349b140
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174951
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
This commit is contained in:
Julius Werner 2013-10-28 20:00:50 -07:00 • committed by chrome-internal-fetch
commit 63f2c4465f
1 changed files with 5 additions and 0 deletions
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5
src/lib/cbfs_core.c
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@ -167,6 +167,11 @@ struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
file_ptr = media->map(media, offset,
file_offset + file_len);
media->close(media);
if (file_ptr == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
ERROR("ERROR: Mapping %s failed (insufficient "
"buffer space?).\n", file_name);
return NULL;
}
return file_ptr;
} else {
DEBUG(" (unmatched file @0x%x: %s)\n", offset,