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uru4000: Ensure we do not overflow image buffer on reading

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Reported by: Keith Linneman (LinnemanLabs)
This commit is contained in:
Marco Trevisan (Treviño)
2026-07-13 08:13:46 +00:00
committed by Marco Trevisan
parent ad8a6f6b17
commit 657c764b73
1 changed files with 11 additions and 0 deletions
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libfprint/drivers/uru4000.c
+11
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@@ -755,6 +755,17 @@ imaging_run_state (FpiSsm *ssm, FpDevice *_dev)
if (num_lines == 0) if (num_lines == 0)
break; break;
/* num_lines is device-supplied; make sure decoding this block stays
* within the captured image buffer (IMAGE_HEIGHT rows). */
if ((size_t) self->img_lines_done + num_lines > IMAGE_HEIGHT)
{
fp_err ("bad captured image: block %d (%d lines) overflows buffer",
self->img_block, num_lines);
fpi_ssm_mark_failed (ssm,
fpi_device_error_new (FP_DEVICE_ERROR_PROTO));
return;
}
fp_dbg ("%d %02x %d", self->img_block, flags, fp_dbg ("%d %02x %d", self->img_block, flags,
num_lines); num_lines);
if (flags & BLOCKF_CHANGE_KEY) if (flags & BLOCKF_CHANGE_KEY)